Adobe InDesign - Manual (Page 106)

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Note: The Out Of Date icon on the Available, In Use, Editing, Text Content, and Graphics Content icons indicates that the content is out of date;
that is, the version on the file system is newer than the version displayed on your computer.
Adobe also recommends
Work with stand-alone documents
Using editorial notes
Editing And Out Of Date Text and graphics frames
Out Of Date Assignments panel
Text Content Out Of Date Assignments panel and text frames
Text Content Up To Date Assignments panel and text frames
Graphics Content Out Of Date Assignments panel and graphics
frames
Graphics Content Up To Date Assignments panel and graphics
frames
Packaged Content Assignments panel
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