If you change Font or Size property's default value of C1OutBar,  you can get the best zoom result by using C1OutBarZoomPolicy.

In C1OutBar, Initial zoomfactor is 100%, screenshot is as below.

The following table illustrates the differences between adding and not adding the C1OutBarZoomPolicy. The ZoomFactor property is set to 130%.

Without ZoomPolicy	With ZoomPolicy