How to change the font size of a PowerPoint themed slide?

I picked out a theme for my PowerPoint presentation but this theme it’s font is caps locked it doesn’t want to go with lowercase fonts. How can I change it?

I chose the theme “Opulent” and when I put the title for my slide the whole thing comes out caps lock but I don’t want it that way. How can I change it so that I can set the font whenever I want uppercase or lowercase?

Opulent is killing me here!