Best practices (team) board filters in combination with advanced roadmaps

[da gze]

Our department recently started using agile. Currently 3 teams are working on their own “agile” island.
To move to “Program / team of teams” level we are looking to advanced roadmaps.

In future we would like to assign epics from projects to the different teams (using the advances roadmaps team feature).
When a issue gets assigned to a team how does the work end up on their board?
I assume it is based on board filters…
If so, what are (team) board filters best practices/requirements?
Do teams share the same big project or are (sub) projects per team and an overarching project the way to go?

Below is the current situation of how the teams operate:
TEAM A: Using a Scrum board with all issues from “Project Alpha”.

TEAM B: Using KanBan board with all issues from their active projects: currently “Project Bravo” and “Project Charlie”

TEAM C: Using 2 separate Scrum boards with respectively all issues from “Project Delta” and “Project Echo”.

Kind regards,

Simon