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Preview is not working properly.
That I have highlighted some of important sentence in my pdf but now they are not even visible😢
MacBook Air 15″, macOS 14.2
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If a simple reboot of your Mac doesn’t fix things, see if the problem still happens in Safe mode. It can take much longer to safe boot so be patient.
How to use safe mode on your Mac - Apple Support
Safe mode will often correct weird software behavior by forcing the OS to do disk repair, clear caches and other housekeeping and disables some features and third-party mods. When you're in safe boot, the machine won’t be at its best performance, especially with graphics, but that's expected.
Does the same thing happen while in Safe mode?
Exit safe mode by restarting your Mac normally and evaluate the issue again.