Press Windows + G to open Xbox Game Bar
Select Capture (or the camera icon)
Click Record to start recording
Click Stop to end recording
To change settings, open Xbox Game Bar settings and adjust Capture options
To record a specific window, select it and then press Windows + G
To record a full screen, open Xbox Game Bar and click Record
Press Windows + Alt + R to start/stop recording (if Xbox Game Bar recording is enabled)
Find saved recordings in Videos > Captures (or in the Xbox Game Bar capture folder)