[@majidmad Participant 5 years, 1 month ago]

Thank you for your prompt reply.
I think I asked my question wrongly. I didn’t mean for a “Single Topic”, I meant for “Topic Pages”
Here is what I did:
There is a forum index:
https://rafiee.net/forums/
Then there is Topic index which users are directed by clicking on Forums name:

Forum 1

In the above page, there are three topics, my problem is that when I click on each topic, the theme is not followed by elementor, please look here:

Topic 3

My exact question is that how did you style the Topic pages?

Thanks again