This is not related. This is the stock Android "currently open/recently opened apps" display.
- This bar, with gesture navigation, swiping up slightly and letting go
- or swiping up normally with 2-button navigation (which sadly got dropped)
- or pressing the ||| (Samsung) or ◻️ (Stock Android) using the still available legacy 3-button navigation
This does not replace a custom set list of apps you would like to quickly access. Maybe something like this could also be integrated as a notification.
I use a patched version of Nova Launcher Prime, working without a Google Account. GrapheneOS, has no internet access. I tried all FOSS launchers and still nothing comes close.
But the recent apps thing is not a launcher part, even though it is broken when removing Trebuchet on LinageOS (trust me, tried it)