Blockstream Green allows you to hide (or "archive") accounts in your wallet, which you can use to clean up your account view or hide currently unused accounts.
Mobile
Log in to your wallet, tap on the account you want to archive then select the Clog menu on top, and tap archive.
Desktop
1.
Open Blockstream Green and visit App Settings.
2.
Choose the option to Enable Experimental Features.
3.
Log in to your wallet and hover over the account you would like to hide, then click the menu that appears and select Archive.
4.
In order to unarchive the account, click the menu above your accounts view and choose View archived accounts.