the checkmark « Jetways exclude Radius » is not present. (See the screen capture JPG here above)
I can see it just fine in your screenshot, but of course you must check it, it's not supposed to auto-enable itself, you must choose which gate you want to exclude a jetway from.
However, in your case, even if you enabled it, it won't change anything because, as you can see from the "Parking has an XML SODE jetway" indication on the jetway type, that scenery already has a SODE jetway, provided by the scenery itself.
Those jetways cannot be excluded automatically with the exclusion method, and this case is explained at Page 14 of the GSX manual, the chapter named "
3rd party sceneries with SODE Jetways"