Increasing the number of posts viewed per page.

Is there a way to do it?

User CP -> Edit Options -> Number of Posts Viewed per Page

User cp, scroll down till you see thread display options, number of posts to show per page. The max is up to 30 posts, though whether that is more then the forum default i don’t know. The forum default could vary with how long posts are however.

There are set limits. You can’t go higher than what is there.