When using an iOS device with a set of AirPods that have previously been paired, is the case also required whilst wearing them or can the buds be used without it?

I'm trying to make some colouring in pages for my daughter, and want to make a large letter per page for her to colour in. On Windows I could select a letter, choose font and there's an outline option that I can check. I can't see this on MS Office for Mac. Is anyone aware of any other ways to ...