Remember that if you are a wayland user, you cannot send your whole screen to OBS - you must treat every browser tab or window that you wish to broadcast as a separate source.
Drcchutch, this is a bit ambiguous/inaccurate. If someone is using Wayland, OBS will only be able to capture windows running in XWayland out of the box. If an application is Wayland-native such as kitty, Firefox when the feature is enabled, and various others, it won't be able to record them. The installation process is somewhat difficult but wlrobs is a plugin that facilitates recording a Wayland desktop. There is a PKGBUILD in the AUR for anyone running Arch that makes it much easier though.