How do I add multiple places in the location and observation rule sections of my project?

I’m probably missing something obvious, but I can’t seem to figure out how to add other states in the location section (or the observation rules->places section) of a project I recently started. I added Minnesota, but if I try to add Wisonsin/Iowa/North/South Dakota, Minnesota gets replaced with the next state that I enter. I see that other projects include multiple places so there must be a way to do this.

Is your project a collectional or traditional one?