Steps
Open the board you want to manage
Click the "Share" button in the top-right corner
View the complete list of all people with access to the board
To update specific permissions, click the permission icons (View, Edit)
To remove someone, click the menu next to their name and select "Remove"
To track who has access, scroll through the full list to see all collaborators
Close the Share panel when finished to save your changes
Notes
You can manage up to hundreds of collaborators on a single board
Changes take effect immediately for all users
Regular audits of your collaborator list help maintain board security
Keep documentation of who should have access to sensitive boards