I can't get rid of the key signature on the template I'm starting with to choose A minor.

I just downloaded MuseScore to try to make some scale sheets for my Private Lesson kids. Natural Minor scale sheets. Of course, A natural minor is my first one. But the template set up 2 sharps for my first key signature and won't let me delete it or drag another one over it. I can't seem to get rid of it no matter what I try.

Any suggestions?

Thanks!