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I’m testing 4.5.0-beta, Remora theme.
In the Edit image interface, the thumbnail is enclosed in a narrow div which I can understand as thumbnails should be small anyway. The fields below though can become difficult to work with. I use the Caption field extensively and I normally resize the field to see what I am writing. The new limit the theme imposes might be OK for mobile devices but i find it too narrow for desktop screens.
It does indeed look great but working with it might drive me up the wall after a while. could that area use a percentage width value?
The caption field can be resized vertically if needs be, which gives ample room to add content. An adjustment of width is not going to happen, sorry.
I did notice the vertical resize but it also increases the scrolling. the page looks good but i would also think of function too.