Created attachment 83082 [details]
Screenshot, with red highlighting around the duplicated parts
In the Math component, there is a new sidebar that contains various mathematical expressions (and duplicates the functionality of the Elements panel).
In the Operators panel of this sidebar, all elements seem to be endlessly repeated. See screenshot.
I would expect all those items to be only there once.
Using LibreOffice 126.96.36.199 (x86) on Windows 7 (also x86).
Not sure this is a bug or intended, because they aren't exact duplicates of each other. Note the small (text) box bellow the operator in your marked section of your screenshot.
Oh, indeed – in that case it's just the missing scrollbars (and that's already reported in bug 65583). Sorry.