My forum and the nodebb's forum seems to have the tag box cut off until you use it.. Once you add a tag the box grows to the correct size:
First one is nodebb-plugin-composer-default, second one is nodebb-plugin-composer-redactor
@Dk is your site public? I can take a look if it is.
@pichalite sloved, i find acp enabled Use a separate route for the composer
but i find some bug, in new page you can't add tag and use the reply button