Embed Video Thumbnail Size and Full (page) Header

Hi - I’m a new Beaver Builder user, so forgive me…

Two questions-

  1. I’ve been adding pages, and making adjustments, and recently I seem to have done something to change how our videos appear on home page. Thumbnails are now really tiny. Any ideas?
    Screen Shot 2020-01-30 at 4.08.23 PM

  2. How do I make my custom header full width on new pages? Not talking about the main header on the page, but specifically the custom headers on subpages. (since I’m a new user, it won’t let me upload a screen grab of this…)