The activity log, accessed via the properties menu, lets you review diagram activity by date, collaborator, and time. Select any item in the activity log to navigate to that edit in the diagram.
The activity log is updated when a diagram is saved or the window is refreshed. Deleted objects can’t be viewed in the log, and comments and added/deleted sheets aren’t listed.
This feature is available with all plans (except the Legacy Free plan) with a limit of 50 entries per diagram for the Free plan and 200 per diagram for paid plans. Entries are deleted once the limit is reached starting with the oldest.