If users can open the HR Admin tab from Access Button, they can see your queries, but not any data they wouldn't normally have.
They only see the query names and the information their access rights allow.
To remove users' access to a query, follow these steps:
Click Access Button,
then click HR Admin.
Click Queries, then click the relevant query.
Click Edit, then click the Name & Description tab.
Select the Only Admin Can Access checkbox, then click Save.
Click Close.