Hi @daniel.boon we plan to implement search by organization name later this year. As a workaround for you in the meantime, you could maintain a separate list of organization names to organization IDs, in a spreadsheet most likely (example below), search for orgs in that spreadsheet and then navigate directly to the link in the Manage Dashboard.
https://manage.auth0.com/dashboard/{REGION}/{TENANT_NAME}/organizations/{ORGANIZATION_ID}/overview
Not ideal but should hold you over until we release the search functionality.