when you have two files from the same module (two writer files, two draw files, ...) open and close one with ctrl + q that the menubar wil shown (if it was hidden).
Samuel Mehrbrodt committed a patch related to this issue. It has been pushed to "master": https://git.libreoffice.org/core/+/81695542af1dc2cc74f16a1ce4b4dd540a64817b%5E%21 tdf#120874 Don't show menubar in other windows when one is closed 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: https://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.