Ultimately, you can not alt -tab out of full screen mode from my experience. Full-screen mode will force you to run windowed if you want to alt tab. As swish stated, you can change windowed mode to run nearly full screen. The only thing you may have to deal with is the title bar showing up on the top and the Windows toolbar on the bottom if you dont have it set to cascade.
You would literally have to reset it to full screen every time you tabbed out.
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Wading through these shitposts like

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