In the Label Style Composer dialog box, click the General tab.
Under Plan Readability, change the Plan Readable value to True.
Change the Readability Bias angle to the angle at which you want the labels to start flipping. For example, an angle of 110 degrees means that label text inserted at an angle greater than 110 degrees is flipped.
Note: The labels are flipped again when they reach 180 degrees from the Readability Bias angle. For example, if the bias angle is 90, the labels are flipped at 90 degrees, and then are flipped again at 270 degrees.
Set the Flip Anchors With Text setting to False to flip labels so they are mirrors of the original labels. Set this setting to True if you also want to flip the label’s anchor point.
Note: In most cases, it is not desirable to have this setting set to True. However, there are cases where it is needed, such as with a station label with a plus sign located always at the station tick.