Is there any way to display support tickets belonging to a certain user?

Please use the following shortcode to display support tickets belonging to a certain author(user):

[support_tickets filter="misc::author::is::USERID;"]

USERID is the id of WordPress user.

In some usecases, you may need to display support tickets belonging to a logged in user. The following shortcode displays the tickets of a logged in user:

[support_tickets filter="misc::author::is::current_user;"]

You do not need to memorize all of this if you purchase Visual Shortcode Builder addon which lets you create simple to advanced shortcodes visually. In most Pro plugins, Visual Shortcode Builder is integrated and available in any WordPress page toolbar using VSB button.