... Or just right click on it and choose "Hide Preview Banner > "

... Or just right click on it and choose "Hide Preview Banner > "

Thank you! I didn't try it! 😅
You have to activate kde!
It is a banner to remind you that you are on the beta. Once KDE 6.6 becomes GA then it is removed. It is mostly used as a support tool so that it is obvious to people trying to help online that you are running a beta
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org/, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.