switch to single category tube?

[oceanude]

Hi,

Simple question but I can't find solution anywhere:
How do I easily turn my multi-category tube into a single-category tube?

I have desactivated all categories, except one, but now index.php shows 1 category thumb only.
I want index.php to directly show top 120 CTR videos from this 1 category only.

Thanks!

[admin]

Edit template index and output <thumb ... there, not <category ...