Thx, i have found where to change.
"oc-content/themes/osclasswizards/search.php"
Find: "if(osclasswizards_show_as() == 'gallery'){"
Change to: "if(osclasswizards_show_as() == 'list'){"
Save, done.
When you click the search button or even set to search only in a specific category, or with some other filter, the result will show in list, the rest of website still on grid.