I’m not sure if it’s possible for 3rd parties to adopt yet, but Ventura has settings to hide Mail accounts, Calendars, and Safari tab groups that are not part of the currently selected focus mode. It’d be great if DEVONthink could adopt this as well to hide certain databases when a certain focus mode is selected.
Thank you for the suggestion, we might consider this for future releases. Contrary to e.g. Mail accounts or DEVONthink To Go it’s of course possible in DEVONthink 3 to easily close all databases and/or to open a workspace to open multiple databases. Not exactly the same but an existing solution for all macOS versions.