What is the reason why I can't hide the number that has been set as the privacy space of 360 security guards when texting me?

There are three reasons. First of all, your 360 security guard is not turned on, so this function is not turned on. The second kind is that when your friend Yuni sends you a text message, you are all online, and your friend sends it directly on this platform, just like sending a QQ message to a super Q friend instead of a QQ message, you can read it directly in the software. The third possibility is that your mobile phone has a virus. If you rule out the first and second reasons, try antivirus. If not, please upgrade your software or reinstall it.