You can pick a color indicator for a table to differentiate it from other ones by some logical reasons.
For example, red means table is under construction, green means - design is complete.
Choose the format tab in the properties panel and pick a needed color in the palette. To delete color and return to initial state choose "Cancel color.
You can set a color for schema, then all tables which belong to that schema will inherit schema color.
For convenience palettes for dark and light themes are the same. Colors look good and contrast for all cases.
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