how to hide the button "collapse" on forum category in the main page?

[ofir24]

i don't familier with that langauge, i try everything, the tag if / else, i switch position to all of them, didn't work, it's just show nothing, and 1 time, i don't know wich time cause i try a lot,
it work except that "$childforumbits" was where the name of the category was, i thought it may be cause i didn't change the id, which i don't know how to do that, i didn't even thing about guessing,
guessing it's not for me, i want my forum to be perfect, not some guessing which will make me lot's of problems.
if you don't know i prefer to leave that as it is.
thanks.