sidebox height to expand as I add categories... "rustic" template

I spent a few hours trying to find the way to change the height of the sideboxes and no luck. I am using a "rustic" template on two websites.
I would like all categories to show, not that people have to scroll up and down. Only three lines show right now.

I am using dreamweaver cs3 and don't have much knowledge of the code. Mostly wysiwyg. In zen cart you don't see anything and that makes it difficult!

So, what do I need to change to make the categories sidebox, or whatever sideboxes to expand as I add new categories or music genres, record companies...?

Websites in question:
https://www.muralistore.com and
https://www.professionalfluterepair.com/store

The categories sidebox expands automatically. The other boxes have admin settings to change the number showing.
Configuration > Maximum Values >
Music Genre List - Scroll Box Size/Style
Number of music genre names to be displayed in the scroll box window. Setting this to 1 or 0 will display a dropdown list.

Thanks so much! I would have never thought of it. Maximum values :blink: It worked, of course.

Yes, the admin has a lot of settings in places you might not think to look for them, unrelated to their specific main topic. Someone a long time ago (maybe even from the osCommerce roots) decided that putting all "maximum" settings in one place was a good idea (though it has not been universally followed.)
Hopefully that will be one of the things changed when the admin is rebuilt a couple of versions from now.