Open the Prime APK file. Install it as a separate app. Once installed, open Nova Launcher from your app drawer.

Nova Launcher Prime (specifically versions compatible with Android 7) offers powerful icon normalization and shape control. You can force every icon on your system to match, whether you prefer:

Nova Launcher Prime for Android 7: The Ultimate Customization Guide If you are still rocking a device on Android 7.0 or 7.1 (Nougat)

Nova replaces the often bloated TouchWiz, Sense, or EMUI skins of the Nougat era with a lightweight framework. It renders the UI faster, scrolls smoother, and consumes less battery than the heavy manufacturer skins that shipped with Android 7 phones.