When the database connection is validly configured but the database remains in an erroneous state, open the database panel by clicking on it in the Connection table and check the errors list. If you encounter the following log: 'QPSQL driver not loaded,' please install the latest Microsoft Visual C++ Redistributable from https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170

After installing the driver, it should initiate successfully.