XF 1.5 How to show message only on 1 page (pagination - forum_view)

It's not really clear what you're asking.

Do you mean you want to display all of the threads in a forum on one page?
If so, there is no option for that - it would require custom development.

It would also make the page unusable and likely cause performance issues if there are hundreds/thousands of threads.
Here is an example on screenshot below.
I want to wrap (big description) in condition that let me show content only for the 1st page, but can hide it on the next pages (2,3,4,5,6,7):
b2.jpg bg1.jpg
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