The command can be started from the main menu by clicking Titles/Replace Colors. It allows you to simultaneously replace up to 3 individual colors with others from the default color palette.
To avoid any possible mistakes replacing a color with a custom created one is intentionally disallowed. However, the colors used by Color Styles will be also included in the palette.
Include both subtitle tracks - the option will be displayed only when the project contains subtitles in the Main and Secondary tracks. Respectively, after activating it subtitles from both the Main and Secondary tracks will be affected simultaneously.
First you need to select the Subtitles Range and then specify the Text Color that will be replaced and respectively the New Text Color it will be replaced by.
In Teletext mode it allows you to change the background colors too. please note that Box Color fields are available when working in Teletext mode only.