An application user interface includes multiple editors, each presenting a data view and controls for operating on data. The application user interface includes a windowed mode and a full-screen mode. The windowed mode displays multiple editors simultaneously, such as in separate windows or panes. The full-screen mode displays a primary editor that substantially covers the application display area. The full-screen mode displays the secondary editors as drawer user interface elements arranged along the edges of the application display area. Secondary editors are displayed and accessed as needed via these drawer user interface elements. The relative arrangement of editors is preserved when switching between windowed mode and full-screen mode. Users can customize the application user interface in either windowed mode or full-screen mode to add, remove, or change primary and secondary editors, with any changes in the application user interface being preserved when switching between windowed mode and full-screen mode.