How to add gestures for an app?

I´m trying to add custom gestures for 3D Slicer application (https://www.slicer.org) in Ubuntu 22.04 to manage 2 finger zoom control.
When I push "+" button a new windows pops up with a message ordering to click on app window but Touché seems to be halt or waiting for something. It´s also impossible to come back to main menu. Maybe I´m doing something wrong....

Thanks on advance!