Preferences > Interface > Apparence > Color Theme
Hmm, all that did was make everything around it darker/lighter. I can't seem to figure out where this white rectangle came from.
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In the same area should be a checkbox to match the pasteboard to the theme color.
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Put the comments together and figured it out! --> Under the Indesign Tab in the top left, go to preferences, then Interface. You'll a dialog box and you'll be in the "Interface" Tab. At the top there is a drop down menu for "Color Theme," mine is selected as medium dark. THEN click the checkerbox that says to "Match Pasteboard To Theme Color."
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Even quicker, View > Match Pasteboard to Theme Color
And do you understand what the pasteboard is for? You can place text and artwork on the pasteboard (there is one behind each spread in a multi-page document) until you are ready to include it on a document page. Objects on the pasteboard will be saved with the file, but if they are beyond the page boundaries, they don't print. It's a handy place to store objects that you aren't ready to use.
Setting the color is a user preference, no matter what the color is, it works the same way.
It is not related to your problem, but I see, that your image is only in the size of the page, but it should extend to the bleed frame.
Go to view menu and choose match pasteboard to theme color, that's it.