I know this thread is old and the OP has, likely, already resolved, but for anyone else looking for the info and using default Novator template (same file name for the other template but in its folder):
1) In your shop directory, go to \extensions\novator\storefront\view\novator\template\common\header.tpl
2) On line 24, edit <div class="w-auto" style="max-width: 260px"> to the size you desire
3) Save, close, clear cache and refresh
Luck!