Password ManagerMore
Exclude Domains
Bitwarden browser extensions can be configured to exclude (i.e. explicitly not offer to save passwords for) specific domains. When a domain is in the Excluded Domains list, Bitwarden won't issue the popup offering to remember an entered password:

To configure excluded domains, open the Settings tab and select the Excluded Domains option:

Domain exclusion does not register "full" URLs, only the domain component. In the above example, https://github.com/bitwarden/browser
would resolve to github.com
when saved, meaning that the browser extension would explicitly not offer to save credentials for Github.