Adobe InDesign - Manual (Page 240)

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You can assign colored labels to the page thumbnails in the Pages panel. For example, you can use color labels to indicate the status of the
pages, such as a green label for complete spreads, a yellow label for spreads being worked on, and a red label for unstarted spreads.
1. In the Pages panel, select the pages to which you want to apply the color labels.
2. From the Pages panel menu, choose Color Label, and then choose the color to assign.
The color label appears below the thumbnail in the Pages panel.
Applying a color label to master pages affects all pages to which the master is applied. However, when you apply a color label to individual
document pages, the color label for the document pages is used. To use a color label for master pages, select the document pages you want to
change and choose Color Label > Use Master Color from the Pages panel menu.
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