So I have gotten this issue in a random day of playing minecraft. After joining 3 different worlds, the cursor does not lock in the screen.
Let me add that a lot of players that play on PC or Laptop have been playing Minecraft Bedrock Edition with this issue, without a solution.

Hope this issue gets patched or fixed sooner, here is proof of the issue. Unfortunately, the video only shows the game screen, so here is what happened:

• Left corner: Opened windows because cursor not being locked or in its place
• Right corner: Opened minimizer, which also closed the game.

Thanks,

fvpm.