When im using my mouse and keyboard, the keyboard works. The mouse works sort of.
It's like touch screen with a mouse, like Roblox have.
You can see it, there is no cross air
Im 90% sure this is a bugg, but if it isn't.
Please make a button to switch it.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-9815.
Full mouse support is not something that has been implemented. If you would like to suggest it, please head to the Minecraft Feedback Site
If you have not, you might like to make use of the search feature before making a new ticket, as it's likely that the issue has been reported already.
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