By default, all users of the workspace have access to all projects inside it. If you want to restrict access to the project — to give it only to certain team members — you need to make it private. For this:
1. Open the project menu by clicking on the three dots next to its name.
2. Go to "Settings".
3. Turn on the "Private" switch.
You can restrict access to the project only if you have a Pro-subscription.
Now the "Team" item will appear in the top menu of the project.
To add team members to a project:
As a result, the person should appear at the bottom — in the list of users with access to the project.
You can also open the project team window from the "All projects" page by clicking on the "Add member" button in the project card.
To withdraw access to a project from a certain team member, just click on the cross next to his name.