The new hand movements and bobbing animations look horrible for me, plus the shorter arm just kills my brain. I'm on windows 10 is there a way to change it back as it looks shockingly bad and unpolished and ruins my brain as the old one from basically the beginning of minecraft looked great.
I don't know anything about changing it but you should be able to disable the bobbing animation in Settings, under Graphics.
Posting in the Bedrock (Also known as just plain "Minecraft" ) section of the forums might bring it to the attention of more people with direct experience of Bedrock. (This is the Java section and while lots of things work the same there are differences.)