Your suggestion worked but every time the theme updates I loose the resize. How do I male this a permanent change. I am using a child theme with Highend.
Go to “Appearance » Editor » HighendWP » functions » template-parts.php” and locate highend_team_member_box function. Inside, you can change the image dimensions on this line:
$image = highend_resize( $thumb, 350, 350 );
Save the file and check if it worked.