When you connect a Keyboard and Mouse to a tablet, Minecraft doesn't recognize that you have attached one and you have to click and drag to look around instead of just moving the mouse.
MCPE-33400
Keyboard and Mouse not properly connecting to Minecraft
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Tablet - Android - Amazon Kindle Fire HD
Amazon OS 5.6.1.0
1.4.0.5
Retrieved
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-9815
The requirement to click-and-drag when using a mouse is currently as designed.
https://bugs.mojang.com/browse/MCPE-9815?focusedCommentId=347670&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-347670
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