Suggested by Carl Cookson – Under Review
The new Kanban view in 2020 Wave 1 only displays the default business process to be used and viewed.
Many customers and partners will leave the default process and create a new one for their use, and these new ones will not be reflected in the kanban board.
In addition, split processes don't work
Status Details
Thank you for the suggestion. We reviewing this idea for our roadmap. Please help us priortize by upvoting for this idea
Thanks,
Revathi Sankar
PM, D365 sales

I hope this is coming soon. We cannot use this feature as-is, but it would be a huge hit if we could use different processes.
Kanban boards are the lifeblood of our sales team. Without kanban for custom Business Process Flows I will never get them to fully adopt the platform.