Once you get a second monitor, you can't go back. It's a sentiment that may seem silly to some, but once you get used to organizing your windows and programs across two or more screens, it's hard to ...
What are you expecting the "Use this device as my primary monitor" option to do, exactly? It's always worked as expected for me (moved all of my icons and taskbar to the primary monitor, as well as ...
My cheap-ish Samsung (cheap for a QHD) has an HDMI and a DisplayPort input. If I hook up a laptop to each input, both laptops think the screen is on- even the one who is not currently being displayed.
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