Go 2 - How to lock orientation?

I have my Go 2 mounted horizontally, and I need it to maintain that orientation. Does anyone know how I can make sure the bottom of my image is the horizon? Thank you for your help.

Example of the problem in 3 screenshots.

1. With "Use FlowState Stabilization" selected, "FlowState Stablization":

2. With "Use FlowState Stabilization" selected, "FPV Stablization":

3.With "Use FlowState Stabilization" UNSELECTED: