@dan-tang-ssd - I think we need 3 things for this:
Create a theme for each panel; (This is mainly set up for UI customisations later, and is something I think we should get into the habit of doing for all new panels)
Change the dashboard page for each panel - for now, just give them a distinct title.
Add a heading to the navigation bar using the PanelsRenderHook::SIDEBAR_NAV_START render hook.
It will be useful, even during development, to have a visual distinction between the 3 different panels, so it's clear during testing where we are.
We can combine this with setting up a custom theme for each panel, as we will need that for later when we come to the visual design of the platform.