Thanks for contacting us about our product!
You can fix it by
Step 1: go to wp-content/themes/haru-circle/framework/includes/ then open file theme-setup.php
Step 2: go to line 140 and add this code: $allowedposttags['iframe']['allowfullscreen'] = true;
This will allow video fullscreen. We’ll check and update in next version!
Hope this help!