Strange behavior while tethering with Fuji X-T1, Capture One Fuji Edition 14.1.0.220 and Mac Mini M1 Big Sur 11.2.3

Hello, new to the tethering process. I connected the Camera via USB with the Mac and Capture. In contrast to all I have read there should be a live-picture, but I can see the picture on the screen? I can change the settings of the camera, aperture, ISO etc., check battery. etc. BUT I can't trigger the shutter? Any hints?
Regards Michael