Disabling lap key during training

Hi everybody!

I am running with my Forerunner 965 and I'm using the training functionality, so it gives me a daily suggestion for running. I always do "Trail run" activities. When I go to the Trail run settings menu, I can see that Lap key is turned off. However when I start a training and accidentally press the back button, it instantly skips the current training-part and jumps to the next one (i.e. stops the current tempo session and starts the next recovery session). Is it possible, to disable lap key for the training as well somehow?

Thanks!