How do I increase my message font size while typing without changing the whole screen size on Mail app?

I don't want to increase the font of the message itself as the received will see it. I just want to be able to increase the message font size as I type it so I can see it better. I don't want to increase the font for the whole computer through Accessibility, JUST for the message as I type it, and ONLY for me (not the receiver) to see it better. Thanks!

Thanks for the reply. Unfortunately, that changes the font size for me and the receiver.