hi milogus,
when you set responsive mode to “disable”
( THEME SETTINGS -> GENERAL -> RESPONSIVE )
then you can change the right sidebar width easily via another theme option:
( THEME SETTINGS -> SIDEBARS -> RIGHT SIDEBAR -> WIDTH )
if you have responsvie behaviour enabled everything is done automatically.
you could add a css snippet though and modify if it works for you:
#container #sidebar { width: 30%; }
might be you also need something more like
#content { width: 65% !important; }
** watch out that your layout doesn’t break when playing around with this.
and add the CSS to your Custom CSS Field in the
THEME SETTINGS -> CSS tab
hope this helps,
konrad