What software is under the hidden function of mobile phone brush?

The mobile phone system is equipped with:

Domestic Android phones, big brands support the hidden space function, and the system has good compatibility and concealment. The only drawback is that it is an open function. Basically, everyone knows that mobile phones have this function. Take Huawei mobile phone as an example:

Settings-Privacy-Open Privacy Space

Mall search:

There are a lot of such tools in the Android App Store. You can directly search for keywords such as "hidden tools" and "hidden app" to get some gadgets as shown below. Please ignore the fortune-telling and positioning applications in the middle.

There are three masters of hiding, nut hiding and social application hiding.