Cursor moving out of screen

In Window Mode:
When you look down cursor will start to moving out of the screen
In full screen mode:
When you look down taskbar appear out of nowhere

i am not sure if this is a feature or not but if it is, it really annoy because in minecraft you have to look down A LOT.
(I can't attach a picture because my screen capture program can't capture cursor/full screen program)

Step to reproduce:
1.Open Minecraft Bedrock Edition on PC
2.Try moving cursor up or down and taskbar will appear