Video iFrame size for hi-res screens

Iā€™m lucky enough to have a 4k monitor at home (I do a fair bit of hobby photography and design work; and in more recent times I need the 4k for working at home).

When Iā€™m using the website though, the iFrame size used in the react-player DIV is really small once rendered (only around 15% of my screen width and height), this means that I frequently end up jumping over to YouTube to use ā€˜cinema modeā€™ to get a ā€˜niceā€™ video size on my screen (which means I lose all the website functionality, such as note taking, etc.).

Is there a possibility to have a hi-res screen layout for the website added to the dev backlog please? I realise that this is very much a ā€˜First World Problemā€™ (and that the YouTube API might not permit this)!

Alternatively, is there a nice workaround that Iā€™m missing?