You can highlight parts of a screenshot by clicking the plus sign and selecting magnify. Afterward, you can choose opacity to make it pop more.
Highlight parts of a screenshot
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How to Block ambient noise in a Facetime call
You can block ambient noise in a Facetime call by opening Control Center during a Facetime call, tapping Mic Mode, and selecting Voice Isolation.
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10 iPhone Tips and Tricks for Screenshots, FaceTime, and More
Useful iPhone tips including screen recording shortcuts, screenshot editing, keyboard tricks, and ambient sounds