Welcome to the forum! 
Well, GNOME 49 has completely dropped support for X11 and is now Wayland-only. This is also the reason why xkill doesn’t work anymore, because xkill is specific to X11.
Tip:
As a new member, you may want to subscribe to notifications for the Announcements > Stable Updates category. Every bundled update, whether it’s for Manjaro Testing or Manjaro Stable, always comes accompanied by a dedicated announcement thread.
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The first post of the thread contains the changes with regard to the previous bundled update.
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The second post of the thread details the potential problems, and how to deal with them.
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The announcement thread also always contains a poll (in the first post), and a summary of past issues (in the second post), for those who’ve skipped an update — which is not advised with a rolling-release distribution, but it does happen.
Well, I’m no expert on GNOME — I myself am a dedicated Plasma user — but in order for people to be able to help you, you should provide us with enough information about your system.
The links below are a preformatted message that I regularly post to new members, but they include some very useful information to help you help us at solving your problems.
Tips and Tricks
How to Request Support
- How to post screenshots and links
- How to find error logs
- How to find system information
- How to post text information as preformatted text
- How to reach a minimal system
- How to use the terminal/
tty - How to use public Pastebin services
Resources