Youtube video link graphic problem

Hello all!

I'm having a problem with the youtube link graphic box. I'm trying to reduce the box to make it smaller but it not adjusting when i grab and drag the corner of the box, it's just cropping it and cutting it off. Not a huge problem on the website but the mobile site looks bad since it only displays part of the youtube graphic (and I simply want to reduce and fit it).

Anybody have any ideas? Most youtube training videos say just grab and reduce it but that apparently I don't have that option. Pics attached!