To change the depth direction in Strater 2 through 4, click View | View Properties. In the Property Manager, change the Borehole Orientation to Elevation. This does not mean that you are displaying elevation values, it just means your depth is increasing upwards rather than downwards (so all of your logs will flip upside-down).
In Strater 1, click View | Borehole View Properties. In the Property Manager, set the Depth Settings to User Defined, and reverse the Starting Borehole Depth and Ending Borehole Depth values to be what you want.
Updated: October 4, 2016