Hi Manish,
if you are an Admin you need to remove the access to the users as per the below screenshot. Remove the "Analysis Workspace:Save As Template" from included Permission item.
In Adobe Analytics Workspace, you cannot give them read/write only access.
If the user has the Permission that includes 'Analysis Workspace Access' and 'Analysis Workspace:Save As Template', they can Save and edit your Workspace project.
If the user has the Permission that only includes 'Analysis Workspace Access' and not 'Analysis Workspace:Save As Template', they can only 'Save As' or 'Copy' the Project in their Dashboard to edit.
Hope this Helps
Regards,
Kumararaja K