Tkinter Wiki   Is there a way to completely block the window controls, including the 'X'-close button at the top corner of a window? UserPreferences
 
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Read Example 7-2 in [WWW]this chapter from An Introduction to Tkinter.

The Tcl Wiki has [WWW]pertinent examples.

It's also possible to remove the {kill,iconify,maximize} buttons or controls with which window managers typically decorate toplevels ... [explain].

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