editing height of post area?

[xafltexans]

I want to change the area of 1. in my screenshot to be smaller by default unless there post goes past the height like it does now..

When this user added a signature it made everything pointlessly longer.

where would I go to edit this?

https://vborg.vbsupport.ru/external/2012/08/65.png

[kh99]

I think this thread answers the same question: www.vbulletin.org/forum/showthread.php?t=285745