I had exactly same issue in the past. I could not change the negative Axes value to positive and still show on the left hand side. Fabs or multiplying by -1 will not work because it changes the display to the right. So I had to hide the Axes and show the Grid. Then I have used the TextBox to show the positive numbers. It is important to uncheck the position Allow Move/Size and also make your Axes range with Static Min and Static Max.
This is not 100% solution for your issue. But a workaround to get it working.
Cheers - DV