Allow Google login Third Parties and Extensions
If you navigate to brave://settings/socialBlocking, you will see an option to enable Allow Google Login buttons on third party sites.
When this option is enabled: It adds a third-party cookie exception for accounts.google.com so sites using Login with Google can work correctly.
If you navigate to brave://settings/extensions, you will see an option to enable Allow extensions to use chrome.identity api.
When this option is enabled: It enables chrome.identity for extensions so extensions can retrieve an OAuth token from google to authenticate users. The OAuth token can be used to retrieve personal information like email id, profile. Please note that this is considered a 3rd party login. Extensions such as Google Keep may require a 1st party login (performed in Google Chrome) and may not work (see here for more information). You can read more about chrome.identity here: https://developer.chrome.com/apps/identity
If you are not logged into Google, these options have no effect for you.