How to change to "recover wallet"?

Hello!

I set up my new Trezor T and intended to set it up as a bridge to my existing hot wallet. Instead, during set up I chose “create a new wallet” instead of “recover wallet”.

Is there a way to undo that/re-do it so I can create a bridge to my hot wallet?

that is how you are supposed to use Trezor. If you just recover your how wallet you are not securing anything, it will just become the same wallet.