The above phone is shipped with the default stock launcher
In Graphene: GrapheneOSLauncher
In CalyxOS: Quickstep

As well as Olauncher for the ultimate simplicity, sophistication and ease of use.
If you consider yourself a minimalist and are looking to eliminate all distractions and focus on what's important, this may be the theme for you.

To change the default launcher go to:
> Apps & Notifications  
> Default Apps
> Home App
> Change Launcher to Olauncher.

Basic instructions:
Hold any empty parts of the screen to access the help & configuration menu.
> Swipe from left to right edge of the screen to launch phone and contacts
> Swipe from right to left edge of the screen to launch camera