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Thank you for all the help! I ended up deleting indesign and setting and reinstalled indesign. And it solved the problem!!
Take the floating document and dock it to the app by dragging it up just below the rulers.
^That^. Plus, make sure Preferences > Interface > Enable Floating Document Window Docking is enabled.
In version 17.4 (2022) go to Window in the top menu line and choose Application Frame.