Google’s Backup and Sync client and File Stream client are only able to connect to a single Drive account, which makes sense given that it is what most people need. However, you might want to have desktop access on Mac or Windows to multiple GSuite accounts if you are part of multiple organizations or if you want to segment the content you have access to into nice logical volumes. A great way to connect to multiple Google Drive accounts is to use ExpanDrive which connects to the Google Drive API letting you mount your account, or a specific path in your account, as a network drive. Since it connects via the API you can connect as many accounts on one machine as you want and access all the files on demand without needing to sync down the content.
It’s easy as authenticating multiple accounts and assigning them unique nicknames, give it a try for free.