Different modes
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*Tools → Options → General* allows switching Thonny's user interface to one of three different modes.

Regular mode
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This is the default mode. Nothing much to say about this.

Simple mode
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In this mode the menus are hidden and toolbar buttons have captions.
Use a small link in the upper-right corner of the main window to return to regular mode.

Expert mode
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This mode looks almost like regular mode, but has some extra features, which are
useful for teachers.

* View menu gets an extra item *Full screen* which puts Thonny to full screen.
* Double clicking on the tab of an editor or view maximizes this editor or view. Unmaximize by typing ESC.
* Tools menu gets an extra item *Open replayer...* which allows replaying user action logs.