When I play Minecraft in BOTH windowed or fullscreen mode it seems as though my cursor isn't bound to the Minecraft window. I have two monitors so this may be the cause. My main monitor (the one Minecraft is displayed on) is on the left and my secondary monitor is on the right.
In Minecraft, when I turn my player to the right, the cursor will freely move to my second monitor. If I don't notice this and click like I'm trying to open a chest or crafting table, whatever my cursor had been moved over becomes the active window and sometimes Minecraft minimizes itself. I have tried restarting my PC.
Likewise, if I move my cursor up, Minecraft's window bar appears and stays until I move the cursor back down again. Also, if I move my cursor down too much, my Windows taskbar appears until I move my cursor back up again.
Basically, I have to be very aware of where I am moving my cursor otherwise my computer will focus on something else other than Minecraft and it is very distracting and ruins the immersion. Please help!
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Yes, but the window title bar and taskbar slide into view when I am walking around and looking around my world in Minecraft because my cursor moves around behind Minecraft, including when I'm not in a crafting table/furnace/enchanting/anvil menu or inventory.
Can confirm this I have this issue for a year and seem like only few people actually have this issue.
It does sound as if this might be related to dual monitors, especially if @Boomber can confirm that he/she is also using two monitors.
i had this issue quite lately as well it will just exit instead of locking the mouse in place for some reason but it dosent always happen
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-27182.
Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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The issue when moving the mouse cursor off the side of the screen may be a bug, I'm not sure. But the behavior of the window title bar or taskbar sliding into view is working as intended. Windows (not Minecraft) does this when you are in a fullscreen app, because if it were to get hung you would need to close the window or open Task Manager, but you would not be able to do this if the title bar and taskbar couldn't be summoned. (Other methods, such as pressing the Start key, might also work, but not all keyboards have a Start key.)