diff --git a/ROADMAP.md b/ROADMAP.md
index 4b7163c..2dbfe0e 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -132,6 +132,7 @@ Newest first.
 - **2026-10-12** · Window close and application/menu Quit ask about unsaved documents; later Cancel keeps every tab open, including earlier Don't Save choices. Approvals are rechecked after edits. Cancelable macOS Dock Quit remains open (#544). No readiness percentage change.
 - **2026-10-12** · Each running app keeps recovery data in its own locked folder; current folder and lock ownership are checked before writes and cleanup. Failed isolation disables recovery with a warning instead of sharing document IDs. No readiness percentage change.
 - **2026-10-12** · Native engine saves and exports replace files atomically; failed writes retain the original, private staging preserves Unix permissions, and valid long filenames work. Desktop Services and CLI raster exports remain separate follow-ups. No readiness percentage change.
+- **2026-10-12** · The Effects panel shows the level its settings apply to ("Group: Color Dodge 100%") and, as in InDesign, Isolate Blending and Knockout Group for a selected group. No readiness percentage change.
 - **2026-10-12** · Words in capitals hyphenate like capitalized words (FERRUM COM-MODI), as in InDesign; Hyphenate Capitalized Words off keeps them whole. No readiness percentage change.
 - **2026-10-11** · `transform.move {copy}`, Edit › Duplicate and Step and Repeat return the copies' ids, so a script can go on with them. No readiness percentage change.
 - **2026-10-11** · `object.fill` and `object.stroke` refuse a swatch name the document doesn't have (it painted nothing) and suggest the name meant (`Paper` → `[Paper]`). No readiness percentage change.
diff --git a/crates/ui-egui/src/i18n.rs b/crates/ui-egui/src/i18n.rs
index 5976d7d..62c9255 100644
--- a/crates/ui-egui/src/i18n.rs
+++ b/crates/ui-egui/src/i18n.rs
@@ -739,6 +739,10 @@ const TABLE: &[(&str, [&str; 5])] = &[
     ),
     ("Apply Cell Style", ["Apply Cell Style", "Apply Cell Style", "Apply Cell Style", "Apply Cell Style", "应用单元格样式"]),
     ("Apply Color", ["Apply Color", "Apply Color", "Apply Color", "Apply Color", "应用颜色"]),
+    ("Isolate Blending", ["Füllmethode isolieren", "Isoler le mode de fusion", "Aislar fusión", "描画モードを分離", "分离混合"]),
+    ("Knockout Group", ["Aussparungsgruppe", "Groupe de masquage", "Grupo de exclusión", "グループの抜き", "挖空组"]),
+    ("Object:", ["Objekt:", "Objet :", "Objeto:", "オブジェクト:", "对象:"]),
+    ("Group:", ["Gruppe:", "Groupe :", "Grupo:", "グループ:", "编组:"]),
     ("Apply Condition", ["Apply Condition", "Apply Condition", "Apply Condition", "Apply Condition", "应用条件"]),
     (
         "Apply Parent to Pages…",
diff --git a/crates/ui-egui/src/i18n/ar.rs b/crates/ui-egui/src/i18n/ar.rs
index c337348..9e37dfd 100644
--- a/crates/ui-egui/src/i18n/ar.rs
+++ b/crates/ui-egui/src/i18n/ar.rs
@@ -1041,6 +1041,10 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Formatting affects container (J)", "تطبيق التنسيق على الحاوية (J)"),
     ("Formatting affects text (J)", "تطبيق التنسيق على النص (J)"),
     ("Apply Color", "تطبيق اللون"),
+    ("Isolate Blending", "عزل المزج"),
+    ("Knockout Group", "مجموعة مفرغة"),
+    ("Object:", "الكائن:"),
+    ("Group:", "المجموعة:"),
     ("Apply None", "إزالة اللون"),
     ("Height Only", "الارتفاع فقط"),
     ("Width Only", "العرض فقط"),
diff --git a/crates/ui-egui/src/i18n/it.rs b/crates/ui-egui/src/i18n/it.rs
index 34766cf..b14398d 100644
--- a/crates/ui-egui/src/i18n/it.rs
+++ b/crates/ui-egui/src/i18n/it.rs
@@ -412,6 +412,10 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Apply Attributes (Eyedropper)", "Applica attributi (Contagocce)"),
     ("Apply Cell Style", "Applica stile di cella"),
     ("Apply Color", "Applica colore"),
+    ("Isolate Blending", "Isola fusione"),
+    ("Knockout Group", "Gruppo di foratura"),
+    ("Object:", "Oggetto:"),
+    ("Group:", "Gruppo:"),
     ("Apply Condition", "Applica condizione"),
     ("Apply Parent to Pages…", "Applica pagina mastro alle pagine…"),
     ("ArtCraft App Page…", "Pagina dell'app ArtCraft…"),
diff --git a/crates/ui-egui/src/i18n/ja.rs b/crates/ui-egui/src/i18n/ja.rs
index de57db5..a90da29 100644
--- a/crates/ui-egui/src/i18n/ja.rs
+++ b/crates/ui-egui/src/i18n/ja.rs
@@ -414,6 +414,10 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Apply Attributes (Eyedropper)", "属性を適用 (スポイト)"),
     ("Apply Cell Style", "セルスタイルを適用"),
     ("Apply Color", "カラーを適用"),
+    ("Isolate Blending", "描画モードを分離"),
+    ("Knockout Group", "グループの抜き"),
+    ("Object:", "オブジェクト:"),
+    ("Group:", "グループ:"),
     ("Apply Condition", "条件を適用"),
     ("Apply Parent to Pages…", "ページに親ページを適用…"),
     ("ArtCraft App Page…", "ArtCraft アプリページ…"),
diff --git a/crates/ui-egui/src/i18n/pt_br.rs b/crates/ui-egui/src/i18n/pt_br.rs
index a4d06bb..ee51a39 100644
--- a/crates/ui-egui/src/i18n/pt_br.rs
+++ b/crates/ui-egui/src/i18n/pt_br.rs
@@ -1045,6 +1045,10 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Formatting affects container (J)", "Formatação afeta o contêiner (J)"),
     ("Formatting affects text (J)", "Formatação afeta o texto (J)"),
     ("Apply Color", "Aplicar cor"),
+    ("Isolate Blending", "Isolar mesclagem"),
+    ("Knockout Group", "Grupo de vazamento"),
+    ("Object:", "Objeto:"),
+    ("Group:", "Grupo:"),
     ("Apply None", "Aplicar nenhum"),
     ("Height Only", "Somente altura"),
     ("Width Only", "Somente largura"),
diff --git a/crates/ui-egui/src/i18n/uk.rs b/crates/ui-egui/src/i18n/uk.rs
index 9b70204..0314ee4 100644
--- a/crates/ui-egui/src/i18n/uk.rs
+++ b/crates/ui-egui/src/i18n/uk.rs
@@ -415,6 +415,10 @@ pub(super) const TABLE: &[(&str, &str)] = &[
     ("Apply Attributes (Eyedropper)", "Застосувати атрибути (піпетка)"),
     ("Apply Cell Style", "Застосувати стиль клітинки"),
     ("Apply Color", "Застосувати колір"),
+    ("Isolate Blending", "Ізолювати змішування"),
+    ("Knockout Group", "Група вибивання"),
+    ("Object:", "Об’єкт:"),
+    ("Group:", "Група:"),
     ("Apply Condition", "Застосувати умову"),
     ("Apply Parent to Pages…", "Застосувати шаблон до сторінок…"),
     ("ArtCraft App Page…", "Сторінка програми ArtCraft…"),
diff --git a/crates/ui-egui/src/panels/properties.rs b/crates/ui-egui/src/panels/properties.rs
index 49cb920..695bb14 100644
--- a/crates/ui-egui/src/panels/properties.rs
+++ b/crates/ui-egui/src/panels/properties.rs
@@ -1988,6 +1988,13 @@ pub fn effects_panel(app: &mut DesignApp, ui: &mut egui::Ui) {
             let _ = app.run("object.opacity", json!({"opacity": (v / 100.0).clamp(0.0, 1.0)}));
         }
     });
+    // The level the settings apply to, with its blend mode and opacity ("Group: Color Dodge 100%").
+    let group = matches!(it.content, designcraft_doc::Content::Group { .. });
+    ui.horizontal(|ui| {
+        let level = crate::i18n::tr(&app.ui.language, if group { "Group:" } else { "Object:" });
+        crate::rtl::label(ui, egui::RichText::new(level).font(crate::theme::semibold(12.0)));
+        crate::rtl::label(ui, format!("{} {}%", crate::i18n::tr(&app.ui.language, it.blend.label()), (it.opacity * 100.0).round()));
+    });
     divider(ui);
     let ds = it.effects.drop_shadow.clone();
     let mut on = ds.on;
@@ -2030,6 +2037,20 @@ pub fn effects_panel(app: &mut DesignApp, ui: &mut egui::Ui) {
             ui.end_row();
         });
     }
+    divider(ui);
+    // Groups only, as in InDesign (greyed for other objects).
+    ui.horizontal(|ui| {
+        let mut iso = it.isolate;
+        let label = crate::rtl::widget(ui, crate::i18n::tr(&app.ui.language, "Isolate Blending"));
+        if ui.add_enabled(group, egui::Checkbox::new(&mut iso, label)).changed() {
+            let _ = app.run("object.transparencyGroup", json!({"isolate": iso}));
+        }
+        let mut ko = it.knockout;
+        let label = crate::rtl::widget(ui, crate::i18n::tr(&app.ui.language, "Knockout Group"));
+        if ui.add_enabled(group, egui::Checkbox::new(&mut ko, label)).changed() {
+            let _ = app.run("object.transparencyGroup", json!({"knockout": ko}));
+        }
+    });
 }
 
 pub fn preflight_panel(app: &mut DesignApp, ui: &mut egui::Ui) {
@@ -2208,3 +2229,68 @@ mod tests {
         assert_eq!(after, name, "clicking the swatch chip applies it");
     }
 }
+
+#[cfg(test)]
+mod effects_panel_tests {
+    use super::*;
+
+    /// One frame of the Effects panel: the text painted and where.
+    fn frame(app: &mut DesignApp, ctx: &egui::Context, events: Vec<egui::Event>) -> Vec<(String, egui::Rect)> {
+        let screen = egui::Rect::from_min_size(egui::Pos2::ZERO, vec2(320.0, 400.0));
+        let time = ctx.input(|i| i.time) + 1.0 / 60.0;
+        let mut out =
+            ctx.run_ui(egui::RawInput { screen_rect: Some(screen), time: Some(time), events, ..Default::default() }, |ui| effects_panel(app, ui));
+        out.textures_delta.clear();
+        let mut v = Vec::new();
+        for s in out.shapes {
+            if let egui::Shape::Text(t) = s.shape {
+                v.push((t.galley.job.text.clone(), t.visual_bounding_rect()));
+            }
+        }
+        v
+    }
+
+    fn click(app: &mut DesignApp, ctx: &egui::Context, label: &str) {
+        let labels = frame(app, ctx, vec![]);
+        let pos = labels.iter().find(|(t, _)| t == label).unwrap_or_else(|| panic!("{label} is painted")).1.center();
+        for pressed in [true, false] {
+            frame(
+                app,
+                ctx,
+                vec![
+                    egui::Event::PointerMoved(pos),
+                    egui::Event::PointerButton { pos, button: egui::PointerButton::Primary, pressed, modifiers: egui::Modifiers::NONE },
+                ],
+            );
+        }
+    }
+
+    #[test]
+    fn the_effects_panel_shows_the_level_and_isolate_blending_and_knockout_group_for_groups() {
+        let mut app = DesignApp::new(designcraft_engine::Session::new(), Default::default());
+        app.run("file.new", json!({})).unwrap();
+        let a = app.run("frame.create", json!({"rect": [72, 72, 144, 144]})).unwrap()["id"].as_u64().unwrap();
+        let b = app.run("frame.create", json!({"rect": [100, 100, 200, 200]})).unwrap()["id"].as_u64().unwrap();
+        let g = app.run("object.group", json!({"ids": [a, b]})).unwrap()["id"].as_u64().unwrap();
+        app.run("selection.set", json!({"ids": [g]})).unwrap();
+        app.run("object.opacity", json!({"opacity": 1.0, "blend": "colorDodge"})).unwrap();
+        let ctx = egui::Context::default();
+        crate::theme::install_fonts(&ctx, "en");
+        crate::theme::apply(&ctx, &Tokens::for_brightness(crate::theme::Brightness::default()));
+        let texts: Vec<String> = frame(&mut app, &ctx, vec![]).into_iter().map(|(t, _)| t).collect();
+        for expected in ["Group:", "Color Dodge 100%", "Isolate Blending", "Knockout Group"] {
+            assert!(texts.iter().any(|t| t == expected), "{expected} in {texts:?}");
+        }
+        let item = |app: &DesignApp, id: u64| app.session.doc().unwrap().doc.item(designcraft_doc::ItemId(id)).cloned().unwrap();
+        click(&mut app, &ctx, "Isolate Blending");
+        assert!(item(&app, g).isolate);
+        click(&mut app, &ctx, "Knockout Group");
+        assert!(item(&app, g).knockout);
+        // Another object: the level is Object, and the group options are greyed.
+        app.run("selection.set", json!({"ids": [a]})).unwrap();
+        let texts: Vec<String> = frame(&mut app, &ctx, vec![]).into_iter().map(|(t, _)| t).collect();
+        assert!(texts.iter().any(|t| t == "Object:"), "{texts:?}");
+        click(&mut app, &ctx, "Knockout Group");
+        assert!(!item(&app, a).knockout);
+    }
+}