Please have a look at the attached screenshot. These undo and redo items are
redundant in the menu since these items are present as buttons directly above
the menu button.
Created attachment 150352 [details]
The actual layout of Notebookbar variants is up to the designer. Redundancy is per se not bad and I cannot argue whether or not having double it. It just depends on the design.
andreas kainz committed a patch related to this issue.
It has been pushed to "master":
tdf#124392 remove undo/redo commands from groupedbar drop down
It will be available in 6.3.0.
The patch should be included in the daily builds available at
https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.
Andreas, please resolve this ticket as fixed if done.