thank you both for the translation
@varnie We maintained a simple user guide for KOReader in :
https://github.com/koreader/koreader...der-User-Guide, you should be able to find the answer for your frist question there. As for Q3, are you trying to change the font size in pdf/djvu or epub?
@piperclassique
on/off means the on/off toggle in the config menu, so it means turn on/off a feature.