The Candidate and Contact searches have a GDPR section.
Users can create searches for people where Consent has been received (Consent = Yes) and where Explicit Consent has been received.
Users can also search on people being processed by Other Methods:
Contract
Legal Obligation
Legitimate Interest
Public Task
Vital Interest
Saved Results
From a set of Contact or Candidate saved search results, users can use a Batch process to send the Consent/Permission Request: