OBS Not Capturing Main Monitor After NVIDIA Driver Update

[Joos71]

My OBS has stopped capturing the main monitor and only works with the second monitor, even though I selected the main monitor in the settings. This issue started after updating the NVIDIA drivers—everything worked fine with the older versions. How can I fix this problem while still using the latest drivers, which are necessary for new games?

 

[Joos71]

Main monitor: LG 27GL850-B Nano IPS HDR10 QHD, resolution 2560x1440, refresh rate 144 Hz.
Second monitor: LG 24MP59G-P, resolution 1920x1080, refresh rate 75 Hz.