Final Cut Pro requires that your computer's display be set to Millions so that it can accurately represent video content. Additionally, elements of Final Cut Pro's interface require the Millions color setting to display correctly.
To set or verify your display's color setting:
If you have more than one display connected, there will be a separate settings panel for each display. Verify that each is set to Millions of colors.
Without the color setting at Millions, unexpected results might be observed in the appearance of the Title Safe and Action Safe overlays in the Canvas.
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