Ben, you are changing only the database connection in database manager for Wappler itself, but you need to change also the database connection in the Server Connect panel, globals, which is used for your web server.
I confess all these database connection changes are confusing. Previously we simply had targets, now we have targets via the workflows global definitions AND effectively another set in the project definitions in the project settings specially for wappler? I personally dont see the point in the database section of the project definition anymore?