It’s used to move the teleprompter forwards and back.

Ah gotchat. Thanks

https://www.reddit.com/r/LinusTechTips/comments/pu1a9d/some_time_ago_i_noticed_that_the_remote_for_the/?utm_source=share&utm_medium=ios_app&utm_name=ioscss&utm_content=1&utm_term=1

To make his hands look big?...

He has small hands, a bigger controller doesn't work for him

its a 8bitdo controller

He also had adhd so it could be there to also help with thinking.