K2 2.6.6
J 3.0.3

The radio buttons are aligned vertically instead of horizontally. Is this a mistake?

Hello,

Nope K2 inherits Bootstrap's styling.

Where can I override this vertical stacking?

We do not like the amount of scrolling and visual confusion it creates.

I tried firebug but the browser crashes, which is odd to me.

You can edit directly your templates styles or the K2 styles located at /media/k2/assets/css/k2.css.

You should also keep a copy of your styles since you might lose it when you upgrade.

Found it on Line 272 k2.css

.xmlParamsFields fieldset.panelform ul.adminformlist li div.paramValue label {margin:0 4px 0 0;float:left;}

Why would k2 have the float to none!important ?