How to give user ability to clear selected state of control?

1. How do I grant users rights to manage services?
2. How do I assign permissions to Azure DevOps?

How do I grant users rights to manage services?

In the console tree, click System Services. In the right pane, double-click the service whose permissions you want to change. Click to select the Define this policy in the database check box, and then click Edit Security. To configure permissions for a new user or group, click Add.

How do I assign permissions to Azure DevOps?

Open the web portal and choose the project where you want to add users or groups. To choose another project, see Switch project, repository, team. Choose Project settings and then Permissions. Choose Project Administrators group, Members, and then Add.