I have followed some instructions for adding buttons to toolbars but nothing changed.

I would like to add a button to that short blue section where the MenuBar toggle is lit up, and also remove the Open button.
I don’t know what that toolbar is called and I would like to know how to customize it.
This calls the “Notebookbar shortcuts”
In older versions, there was a separate tab for this.
https://wiki.documentfoundation.org/Videos/CustomiseWithToolsCustomizeMenu#Customize_Notebookbar
With me:
Version: 26.8.0.3 (X86_64)
Build ID: bce0998afefdbc355585ca324285661a2170ba77
CPU threads: 16; OS: Windows 11 X86_64 (build 26300); UI render: Skia/Raster; VCL: win
Locale: en-US (de_DE); UI: en-US
Calc: CL threaded
Are you referring to the “Notebookbars” tab? If so, has that tab anything to do with the “Notebookbar shortcuts” toolbar?
Thank you so much! Worked like a charm. So often you just need to know what something’s called!
