Source: Final Cut Pro X: Target specific areas using shape masks

When you draw shapes to create areas of transparency in an image, you are masking that image. Final Cut Pro has a number of powerful masking tools for creating areas of transparency in a video clip or still image. You can use

If your project contains multiple instances of a particular word or phrase displayed in multiple title clips, such as names, company names, or job titles, you can find the specific word or phrase and quickly change each instance of it.