Give users access to the new workspaces in Power BI
After you create one of the new workspaces in Power BI, or if you have an admin role in a workspace, you can give others access to it by adding them to the different roles. you'll want to give users access to it. Workspace creators are automatically admins. See Roles in the new workspaces for an explanation of the different roles.
Note
To enforce row-level security (RLS) for Power BI Pro users browsing content in a workspace, assign users the Viewer Role.
Give access to your workspace
Because you have the Admin role in the workspace, on the workspace content list page, you see Access.

Add security groups, distribution lists, Microsoft 365 groups, or individuals to these workspaces as admins, members, contributors, or viewers.

Select Add > Close.