Which driver are you currently using for the 6 ?
If it is the official Aeotec 6 edge driver the sensativity setting is found by tapping the 3 dots top right and selecting settings
If you are using the old Groovy connection you will need to install the Aeotec driver
But first we need to know your current connection method
Or try putting some tape across the lower front of the window to see if it blocks the cat but not humanoids, low tech but can work