Consistency of the modal size "full screen"

Dear all,

In search for a way to show pictures full screen I experience a limitation - that I suppose can be resolved quite easily:

Can you please make the general theme setting ‘fixed width’ also apply to the width of the modal option ‘full screen’? Right now this option results in a modal which is actually full screen, while the content therein is limited to fixed width as the general theme setting. This looks quite unattractive with white spaces on both sides (of a picture that I like to maximize).

Even better: please provide an option that allows the content of a modal opened at ‘full screen’ also to be shown full screen (and not be restricted to the general theme setting’s fixed width).