My manager has an open-door policy for all staff.
open-door policy
idiomA policy or usual practice, by a person in authority, of permitting subordinates or constituents to visit his or her office unannounced and at any reasonable time for the purpose of discussing matters of concern.
Because the director maintains an open-door policy, employees feel comfortable walking into her office to share new ideas.
The department head established an open-door policy to foster transparency, ensuring that any team member could voice concerns without the need for a formal appointment.