Adobe InDesign User Manual
Page 440

Highlight lines that are too loose or tight
Because composing a line of type involves factors in addition to word spacing and letterspacing (hyphenation preferences, for example), InDesign
cannot always honor your settings for word spacing and letterspacing. However, compositional problems in lines of text can be highlighted in
yellow; the darkest of three shades indicates the most serious problems.
1. Choose Edit > Preferences > Composition (Windows) or InDesign > Preferences > Composition (Mac OS).
2. Select H&J Violations and click OK.
Adobe also recommends
Justify text next to wrap objects
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