imovie can't change font size when using iphone 14

Hi folks, Can someone help me -- Whwen making imovie, I can't increase the font size when using iphone 14. Initially I get the size I want, but once I press "done", the font gets itiny.

I am also can't figure out how to jump to another line. Say I want to put three names in a row vertically, there is no return button I can find.

I am using a iphone 14

Help and Thanks!

debo