If it's a bug, then reinstalling won't do anything. You could try first creating a new user and checking out that happens with it too. Also, open a bug - it will help others too.
Not sure how you determined a reinstall is going to solve the problem. Looks like a bug. I’d suggest filling bug report.
It’s pretty trivial to “reset” the desktop to default if you think there’s config file problem rather than a bug with a recent release. Again, can’t really wrap my head around a reinstall solving this.
Two top comments are exactly right: file a bug ticket.
Just wanted to tag on that reinstalling an entire Linux environment really makes no sense ever, unless you're sure you nuked some kind of files belonging to a crucial package, in which case, you just reinstall the package. There is absolutely no good reason for a full install of the OS, ever.
Try to switch to the different display server (to Wayland if you're on X11 or the other way around)
Isn't the resize application launcher a plasma widget? If it is, have you checked its compatibility with plasma 6?
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0