Comments
Comments are conversation threads attached to committed elements. They let reviewers and collaborators capture context, questions, and decisions alongside the diagram data itself.
Where You See Comments
Comments appear in the Explorer Panel (the Model Explorer tab in a board's preview) — in a dedicated Comments column next to each element row.
If an element has no comments, the cell is empty.
If it has comments, a chip shows the first comment's text with a badge indicating the total count.

Opening the Full Thread
Click the comment chip on any row to open the Comments dialog. The dialog lists all comments for that element:
Sorted newest first
Each entry shows who wrote it and when (created by + created date)
Entries are scrollable for long histories
What Comments Are Tied To
Comments are attached to individual committed elements — the ServiceNow records behind your shapes. They travel with the record, not with a specific version of the board, so commenters on a shared ServiceNow record see each other's entries regardless of which board they opened.
Read-Only in the Explorer Panel
In v26, the Explorer Panel shows comments as read-only. Adding, editing, or deleting a comment from the Explorer Panel is not available — the dialog is for reading the thread.
Comments are typically added as part of the Commit / Reject flow (where a rejection requires a reason, which becomes a comment on the element).
Roles & Gating
Any user who can open the Explorer Panel and see the row can read its comments.
Adding/editing comments happens through related workflows (rejection, ServiceNow-native commenting on the underlying record).
Limits & Gotchas
Comments column is only visible when at least one element in the grid has comments — if the column is missing, nothing has been commented yet.
You're looking at comments on the underlying record, not board-specific annotations. Changes made in ServiceNow show up here too.
Sort is fixed — newest first. There's no way to flip to oldest-first in the current dialog.
Related
Commit — rejection reasons are saved as comments
Data Panel — inspect the underlying record
Notifications — status updates from commit/reject that reference commented elements
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