I’m using the app on android, it’s maybe a little messy when you use it for the first time but when you start to use it daily, I think there is a lot of useful features all around. I understand for the font, but it’s not something that is bothering me, I can’t say anything on that. For the issue you are facing with To Do, you actually have two ways to create a To Do list:

• You can create a new Notebook and add to-dos in it and these can have a body for description purposes.
• Or you can make a note containing the to-dos using the markdown checkbox

Take a look at Joplin

I haven’t got this kind of issue with nextcloud, I’m pretty sure you can reset your password using occ via cli