I’ve been meaning to post about this for years now, but I’ve always been hoping it would be fixed without me having to bother about it.
The default page size in the lesson reader is always incorrect when I open a new lesson, meaning I have to 1) click on the reader settings menu (and I often confuse it with the three dots menu in the reader), and 2) then move the page size setting to either Medium or Large.
This fixes the problem, but having to do it for every lesson is a continual pain. I’m using the latest version of Firefox on a Windows computer.