Please share it with your friends also.
If you try to pin an application window as you would in desktop mode on a Windows 10 tablet, it can simply return to full screen mode as soon as you try to pin it.
Please refer to it for steps on how to go about it.
Refer to step 1 of How to split screen on a Mac above.
Select the window you want to display with a left-click on your mouse.
Splitting the screen is useful for multitasking and eliminates the need to switch back and forth between two windows.