Thanks @baris I have done.
Cannot enter Topic Title on mobile Persona theme Yeti skin
I'm running the standard persona theme, and on mobile it's really unintuitive how to get to the title entry place (you have to tap on the main text entry and then use the up and down buttons on the keyboard to move to the field up above). Furthermore, the text color is the same as the background so you can't even tell you are typing. This seems to be a problem with the Yeti skin.