Tethering options are limited for the X-T30.
if you have the latest firmware version installed (v 1.40)
---- https://fujifilm-x.com/global/support/download/firmware/cameras/
you are supposed to be able to use the camera as a web-cam.
Welcome !
Newbie myself to the Fujifilm's world.
The GFX 100S is a lot of weight to carry around, unless the kind of pictures you want to take requires very high resolution.
I am transiting from the full-frame world to APS-C to downsize the weight 🙂