Fullscreen Videos Wrong Size

Hi, i just started making my own blog site using Elementor and i want to mainly upload pictures and videos.

So i created my first post, but when i uploaded a video i was only able to change aspect ratio so 9:16 because it’s a selfie video i’m using, but when going full screen the video seems to change ratio to 16:9.

Maybe i didn’t check everything, i’m gonna keep looking, meanwhile if you have any suggestions feel free to reply