Problem: the extra panes of View > Switch View Layout were fixed to Top, Front and Right, and the 3D View menu only changed the main view.
Fix: every extra pane has a view selector (Active Camera, Default, Front, Left, Top, Back, Right, Bottom, Custom View 1-3). The choice is kept per comp in Views3D::panes (serde default, so older editor states load with Top/Front/Right) and set by the new command view.setPaneView {pane 0-3, view}. The Active Camera pane renders through the comp camera.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>