Mirrrored left and right? that would be the X axis and you’d need to do that test making sure to answer the question for X axis correctly. IF you jog left, it is likely moving towards the right and this in incorrect.
IF you want to edit this setting manually here is the chart to use and you’d need to edit the $3 setting.
You can access this setting like this:
You would need to READ the current $3 setting, Plot it into the chart and select the new value based on keeping the Value for Z&Y and only changing the setting for X axis to or from inverted…
I’m guessing you can see how using the Easel integrated method is much simpler.