Power tailgate

[Chas44]

My query is how can I set my 2023 (nov) ultimate to only open the boot using the touch pad on the boot. Not the key or the button in the car.
Why? Because I had my keys in my pocket withthe car locked in my garage and I saw my boot open and luckily miss the door. To avoid inadvertant damage, I thought I could turn off "power tailgate " . When I do, the tailgate unlocks, using the pad on the boot, then does not open, but simply locks again.
Any ideas? Many thanks,