It's an option, that's all.

I keep information for anyone who's shot with our club.  If someone shoots the state championship but doesn't participate in our local matches, for example, I can reduce clutter by not having his name on my regular list, but don't have to erase the data altogether.

Of course, if you prefer you could install another instance of ForScore in a different folder or on a different computer, and just use that for a special match.  In that case, you can use Program Preferences to set a custom screen background banner to remind yourself instantly what installation you're working with (as shown below).  (Banner not available with the demo version.)

You can also maintain a separate data folder for a specific match or for a different club.  The banner can be different for each data folder.  Or for each server if you're using Compare for a sanctioned match.

This shot also shows the custom toolbar that you can configure (not covered in the tutorial.)