Note Style Disabled or Nonfunctional?

HI,
I’m new to this software and this forum, apologies for any really ignorant questions I ask in advance. So I’m using scapple for the first time and I cannot figure out how to select Note Styles. The option is grayed out, even though there are like six or seven note styles to choose from. Can anyone help me understand this? I see that you can import note styles (no idea where to get those from yet), but I see no way to activate the ones that are already available supposedly in this copy of Scapple I bought. Any help would be appreciated, thanks.

To get the obvious out of the way: do you have one or more notes selected (there will be a blue outline around them)?