I have a monitor connected to my PC via bluetooth that I did not connect, what should I do?

[Windows 10]

Two weeks ago I was working on my computer when sunddendly it blacked out, a few seconds later it turned back on it looked normal, until I went to connect my earphones via bluetooth and I noticed there was a monitor connected to my PC, I also noticed that I couldn't adjust the brightness of my screen and that the suspend option was missing, I tried disconnecting the monitor and reboting my PC, but that doesn't work, what should I do?

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