By default, OBS will choose hardware encoding, but that setting can get a little finicky. For the most reliable results beginners should use one of the software (x264) options instead. Ian Paul/IDG ...

You can change where these are stored in OBS settings, ... You'll need to click Start Replay Buffer on the OBS default page, and you can stop it whenever you don't need the replay buffer running.

Launch OBS Studio. Click Settings from the list placed at the bottom-right corner of the window. Go to the Audio tab and set Desktop Audio to Default.; While you are there, also set Mic/Auxiliary ...

The default paths for OBS on Windows 10 are-x86: C:\Program Files ... verify that the right display is selected in OBS settings and disable any conflicting software overlays or game mode on Windows.