Open OBS, click “+” under “Sources”. Choose “Display Capture”.
You can create a name for it and click “OK”.
In the new window, choose the display ratio, and decide whether you want to capture the cursor or not. After that, click “OK”.
Right-click the created source, and select “Filters”.
Click “+” and choose “Crop/Pad”.
Change the name if you want, and then click “OK”.
Adjust the region that you want to broadcast by entering the numbers behind Left, Top, Right, and Bottom. It will show you the area once you enter a number so that you can locate the appropriate region. Afterwards, click “Close”.
Now you can see the ApowerMirror screen in OBS without any problem.