I don't know what happens then I can't find category.tpl, topic.tpl in my widget setting panel. Is there any plugin do I need to install?
@unbug they are provided by the theme you're using, so if you're using a certain theme, those widget areas won't be available.
@pitaj I never change the default theme, that's why I don't know what happened.
Have you tried running ./nodebb build and restarting?
@pitaj I reset the theme bring them back