When you exit full screen on Minecraft (1.12 Pre-Release 2), you cannot snap windows to the side of the screen or resize them in any way.
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CenTdemeern1
SunCat
Thank you for your report!
However, this issue has been closed as a Duplicate of MC-68754.
It has been linked to this report. If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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migrated
this appeared to me too, found it today, before reading this message. i wanted to make a yt vid...
This happens to some other versions too...