Setting default size of documents in preview window

Currently my DT3 is showing the preview of documents (images, pdf,…) by ajusting width to the width of the window. I’d prefer by default to see the entire document rather than just a part (the document is usually a “landscape” rectangle and the documents are usually “portrait” rectangle.
Is it possible to define “contain” (or the “real size”) for the preview window as default?
Are there any keyboard shortcut to force contain if it cannot be defined by default

I have to add that when I place preview window to the right (rather than below) I have this “contain” effect

See Preferences > Files > Multimedia

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