Here is how you can hide or unhide apps on an iPhone. You do not need to install any other third-party apps for this.

To hide an app, simply long press on the app you want to hide until a menu appears. Select Require Face ID, then choose Hide and Require Face ID. And then you can choose Hide App.

To bring the app back, swipe from the extreme right to the left. Scroll down until you see the hidden folder. Open the folder, long press on the app, and remove Face ID. This will unhide the app.

However, there is a small flaw in hiding apps. Even though the app is hidden and requires Face ID to open, it can still be found in the App Store. Anyone can search for the app and see that it is installed on your device, making it easy to check if a specific app is hidden.

Hope this video helps. Thank you very much.