it depends, how your skin specifies widths of the panes, there are different techniques depending whether it is a table or div based skin.

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Cheers from Germany,
Sebastian Leupold

   

Speed up your DNN Websites with TurboDNN

I've had this answer from DrNuke for adjusting Flexi2 layout:

(I'm trying to make a small right-hand column to my forum, and I can't make it as small as I want using contentpane2 for the forum and rightpane3 for usersonline, announcements and such)

1. You can do this with CSS.
2. Go to Admin > Site Settings and scroll down to the stylesheet editor.
3. Add the following CSS.
4. .RightPane3 { width:25%; }
5. Click “save style sheet” and refresh your site.
6. You can adjust the width value to whatever you need.