With the rich text editor disabled, when a user edits their comment, the default textarea is too small. Instead of filling the comment area, it is only about 150px wide. This is awkward on mobile, but even more so on desktop. Clicking into the small textarea then expands it massively tall to fit the text.
This is reproducible across mobile (with default settings of no rich text editor) as well as multiple browsers (Safari, Chrome).
The CSS codes should be added to the "Custom CSS code" textarea. It's located in the Dashboard > wpDiscuz > Settings > Styles & Colors admin page.
In case you want to say thank you! 🙂 We'd really appreciate if you leave a good review on the plugin page. This is the best way to say thank you to this project and the support team.