How to Set Parental Controls for Play Store on Android
The parental controls for Play Store lets you restrict content on your Android device unless a PIN is provided. For example, you can restrict ...
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Grid size for Android apps and widgets on the home screen is changed on Nova Launcher. To change Grid size on Nova launcher and set rows & columns size do as follows:
1. Go to Home Screen and hit "Menu Button"
2. Select "Nova Settings"
3. Tap "Desktop"
4. Tap "Desktop Grid" to change row and column size for your phone's desktop
See:
How to Hide Dock on Nova Launcher
How to Hide Notification Bar on Nova Launcher