Overview of ERD Node Grouping
As the number of nodes in an ERD increases, the model becomes progressively harder to read and interact with, especially when many entities are related, recurring patterns appear, or you need to focus on a specific part of the model. Node grouping lets you organize related entities into clearly named sections so your diagram stays readable, navigable, and easier to maintain.
Grouping is designed to support both day-to-day exploration (understanding the model faster) and active design work (restructuring, comparing, and iterating on schema areas without losing context).
Why grouping is needed
Reduce visual clutter in large ERDs
When everything is flat on the canvas, relationships and entities overlap visually. Groups create visual “zones” so the diagram is easier to scan.
Make the ERD easier to understand for different audiences
Groups help communicate intent by letting you label and frame sets of entities (e.g., “Billing”, “Identity”, “Telemetry”), which is especially helpful for:
- New team members onboarding
- Cross,team reviews
- Architecture/design discussions
Support focus and progressive disclosure
Grouping supports workflows where you want to zoom in on one area without losing the bigger picture. The ability to collapse/expand groups means you can hide complexity temporarily while still seeing how high,level areas connect.
Keep organization durable (saved with the diagram)
Grouping isn’t just a temporary view tweak,group structure and state are intended to be saved as part of the ERD view, so collaborators see the same organization when they open the diagram again.
Common use cases
Use case A: Organize by domain / bounded context
Group entities that belong together logically:
- Customer / Accounts
- Orders / Fulfillment
- Billing / Invoicing
- Identity / Access
Why it helps: reviewers can reason about one domain at a time, and the ERD reads more like a system map.
Use case B: Separate “core” vs. “supporting” entities
Create groups such as:
- “Core entities”
- “Reference / lookup tables”
- “Audit / history tables”
- “Integration / external mappings”
Why it helps: reduces noise and makes the primary model stand out.
Use case C: Highlight feature work or migration boundaries
During iterative work, group by intent:
- “New schema (in progress)”
- “Legacy (to deprecate)”
- “Migration staging”
Why it helps: makes it easier to communicate what’s changing and what’s stable.
Use case D: Create collapsible sections for navigation
Collapse groups you’re not actively working on while keeping the diagram understandable at a high level.
Why it helps: lets you explore relationships between areas (not just between individual entities) without being overwhelmed.
Use case E: Clean up layouts during refactoring
As you move entities around or restructure relationships, groups provide a lightweight way to:
- Keep related nodes together
- Re,layout parts of the diagram without losing organization
- Adjust membership (move nodes into/out of a group) as the design evolves
(Optional) What grouping enables at a glance
Depending on the capabilities available in your ERD UI, grouping supports the following:
Named groups
Assign a title to a group, displayed at the top-left of the container.Move and resize groups
Treat a group as a container that can be repositioned and resized within the canvas.Interact with nodes inside a group
Select and move individual nodes independently within the group.Update group membership
Drag nodes into or out of a group to modify membership.Remove nodes from a group
Move a node outside of a group using the context menu.Collapse and expand groups
Toggle between:- Expanded view: Displays all child nodes
- Collapsed view: Displays a summarized view of child node types
When collapsed, the group appears as a compact container with entity names listed inside.
Ungroup nodes
Remove grouping when it is no longer needed.Persistence of grouping
Group membership, names, colors, and collapsed/expanded state are saved as part of the ERD view. When the diagram is reloaded, the grouping is restored as previously configured.