If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
how I can change the filter condition for Portfolio Grid :
Display portfolio entries from Category 1 OR Category 2
Display portfolio entries from Category 1 AND Category 2
Open up /wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/portfolio.php and replace
'operator' => 'IN'
'operator' => 'AND'
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