You will then see your desktop appear you can specify the monitor if you have more than one. You can find help on their site, but to save you time, when using OBS Studio for the first time, click + in the Sources area and then select Display capture. OBS comes with live streaming capabilities that you won't find in native programs of major operating systems, in addition to screencast options. You can control the program via customizable hotkeys and use the built-in audio mixer to create excellent quality videos. However, it can also be used to film what is happening on your Windows desktop. However, it is primarily aimed at those who want to stream on YouTube or Twitch.
OBS Studio is open-source software that is not really intended for beginners.
