"Dash" seems to be a name for it more aligned with Gnome desktop.
The Dash is a name that implies quickness - it is a simplified version of a panel or taskbar that is integrated into the Gnome Shell.
There is no Dash on XFCE (Zorin OS Lite) nor is there an XFCE-Shell... XFCE is fully customizable and modular unlike Gnome which uses integration in an underlying governing structure. XFCE and Mate both call it the Panel.
Windows OS calls it the taskbar.
And they all work differently... even though the general appearance and basic function is remarkably similar.
You can add the means to install the standard .deb package if your build is only offering Flatpak. Several threads cover this but here is one of them: