When I start up the Vital standalone app (I’m using a Mac but this might apply to any platform) the Output setting (accessed by clicking on the Vital logo) is reset to whatever I’m currently using on the computer (usually the internal speakers) instead of what I last set it to.
To clarify: I use a USB audio device for my studio monitors and headphones. I can select that output option from the Output dropdown list. However, when I close the Vital App and restart it the Output setting has changed back to “internal speakers” which is what I use for everything other than music production.