Cannot Access Non-System Databases in SQL Server Express 2016
From the looks of your screenshot, it looks like your query is not connected to the BERNARDO\SQLEXPRESS01 instance and is connected to the BERNARDO\SQLEXPRESS instance (as indicated at the bottom of the query tab).  Change the connection of that query pane to connect to BERNARDO\SQLEXPRESS01 and I suspect your issue will be resolved.