Fedora 43 KDE: Can't Full Screen any software or video

Since the morning, I’m struggling with this issue of not being able to fullscreen any video or software. I have tested YouTube and DailyMotion across Firefox, Zen and Brave, and non of them full screen the video.
I have also tried running Minecraft in full screen, and that too isn’t working.

Here is my system info

Any help would be great. Thanks in advanced :))

I was just tinkering around in the settings.

So there’s a bug with discord that it shows its own headbar and kde’s headbar too (which has closing, minimizing, and resizing option). To fix that, I created a rule for discord specifically in window rule that should have made discord remove the KDE’s headbar(No title bar and frame).

Ironically, the discord’s problem was still not fixed after the rule setup. And idk how but it messed with every other software?

After I deleted that rule 10 mins ago, it fixed everything.

Also, after the Discord’s update, it’s also fixed :smiley: