my trackpad gesture doesn't work on my second monitor.

Hi, I just configured a simple 3 fingers tap to open the Launchpad. It works fine on my MacBook screen but when I do the gesture on my second monitor, the Launchpad opens on the MacBook screen and not on the second monitor.
Is there a setting or a preference I'm missing ? Thanks for your help !

MacBook Pro
Magic TrakPad 2