So what I did was, setup a 2 out of 3 multi sig using jade hardware wallets (QR codes). This works great, sending, receiving, no issues.

Now I loaded one of the seeds  into a Trezor Safe 3. I thought I could replace one of my jades with this Trezor. However, on the sparrow signing tab (see image)

https://orange.surf/content/images/2022/10/multisig-demo-spend-4.png

it is unclear how I should sign with a Trezor. It is connected to my laptop, but signing only seems to work with QR codes.
Any suggestions how I can sign with my Trezor ?