Need help in setting up thumbnail image size [NewsTube, Wordpress]

Hello guys, I've been trying to set custom thumbnail size. NewsTube uses js/composer that has few layouts available. I need to go from landscape to vertical. How can I set height custom height leaving width what it is? Can I use only .css, or I gotta addimage() in functions? If so, there are few function files, main functions.php and newstube_shortcodes.php where you can find these customizations available.


Been searching in support forums etc. Can't find the solution.

Maybe someone experienced something like that?

Attaching some pics.