How to change show only display 2

[Jx zoro]

I had two moniters in which one i had not used and wanted to use it with my main computer so i bought a vga cable and connected it in the begening it was ok because it was on default extend these display . Next day i set it on only show display 2 and turned off my main monitor and after i turned it on it gives no signal so how do i turn off show only 2

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