Dual Messenger

Samsung's user interface One UI allows its users to install supported messengers twice. Dual Messenger, for example, installs WhatsApp or Facebook a second time, allowing two different accounts to be used. This makes sense especially when a dual-SIM-enabled Samsung device is present. If desired, the contact lists can even be kept separate.

Android 10 (One UI 2.0)

Open the Settings
Tap on Advanced features
Tap on Dual Messenger
Enable the desired App
Tap on Install