How do I check what Font I used in the Project?
Well, as long as you haven't changed the name of the "Layer" then you should be able to tell what font was used in the file.
So you have text on your mat and forgot what Font you used.
Take a look at your Layer Properties window and Expand it
Scroll down until you find the letter you recognize - and the font used is in the layer name.
Keep in mind that this only works if you haven't renamed the layer.