TL;DR EndeavourOS fresh install with KDE does not work.
I have been using Arch for years. The last time I did an install was a little while ago on my T440p and I did it manually. I installed KDE and it has been working great ever since. I got a Framework laptop today and decided to use EndeavourOS to install Arch and KDE because I just wanted to get up and running without much hassle. I have tried installing it 5 times now and every time once I boot into the new install nothing works. I cannot click on anything but the start menu and corresponding power options. None of the actual entries are clickable. The wallpaper, desktop and associated windows all flash whenever I move my mouse or click anything. The toolbar is completely broken and the icons are all weird. I cannot click any of the settings options in the settings menu. The only things that are functional are the Endeavour welcome dialog and the start menu options for shutdown. I have tried reinstalling a few times like I said and also tried switching the display manager to lightdm. If I leave it for about 5 minutes, it eventually crashes and restarts.
The previous release of EndeavourOS installer, Neo, also has this issue.
Ubuntu seems to work fine.
Kubuntu also works fine.