As now since 6.0.x version LibreOffice got Accept All Changes and Reject All Changes function (https://bugs.documentfoundation.org/show_bug.cgi?id=101977). It would be nice if these two functions added to Track Changes toolbar since we have added it also Review tab in NB user interface.
Interestingly we had these two all the time at the sidebar. And in the main menu too. So it's definitely needed at the TC toolbar.
Rizal Muttaqin committed a patch related to this issue.
It has been pushed to "master":
Fix for tdf#121187: Add Accept All Changes and Reject All Changes to Track Changes toolbar
It will be available in 6.2.0.
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.