This feature allows you to hide the apps you don't want others to see.
Here's how to hide apps on Samsung Galaxy J3 Pro:
Step 1: Go to settings and select the home screen.

Access settings and choose the display option.
Step 2: Select the wallpaper section.

Enter the wallpaper settings.
Step 3: Choose the hide apps option.

Select the hide apps option.
Step 4: Choose the app you want to conceal.

Choose the app you want to hide.
That completes the setup. Wishing you success in your endeavors.