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open book User interface

Structure of the Rich Client UI: main window, tab bars and window layout.

REFERENZ USER UPDATED: JUL 2026 APPLIES TO NUCLOS 4.2026.X

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The interface is flexible and customisable. Window sizes, sorting and views are saved per user.

Main window

Screenshot-Platzhalter

The main window with menu bar.

Fixed menu bar (File, Edit, Window, Help; on macOS in the system menu), workspaces (permission-based) and the global search.

Tab bar & start tab

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Toolbar of a tab bar.

Each split has a start tab (home tab) to control it:

  • Maximise – hides other tab bars.
  • Close – removes the split.
  • Active home/tree tab bar – where new tabs resp. tree tabs open.
  • Extras – start tab settings (incl. Desktop).

Window layout

Screenshot-Platzhalter

Split a tab bar via drag & drop.

Tabs can be moved by drag & drop; dragging a tab over content creates a new split. Disable splitting via Window → Disable window splitting.

Related pages

gear Settings


Adjust the view.

Open →

desktop computer Desktop of a start tab


Customise the start tab.

Open →

busts in silhouette Workspaces


Predefined environments.

Open →

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