Not yet (and maybe never).

I wanted to bring this up several years ago (the uber simple 'select all' etc. Checking each and every challenge is a *major* pain *and* a waste of time). I was surprised that there was no 'toggle switch' to choose all (and then un-check those Team Challenges you don't want to compete in). Some are a tad 'too much').

I mean, this is *so* easy to implement. After all this time ....

THere are other issues but I'd rather not complain after this one.