People who are added to your workspace will have the same plan as yours. For example, if you're on a Pro plan, your team members will also be upgraded to Pro.
But they can not access any formaloo/folder on your workspace unless you share those formaloos and folders with them.
To share access with a team member, right-click that folder or formaloo and select access management. To add new team members, enter their email addresses on the workspace members page.