You can adjust the increments in which the X, Y, and Z axes move by clicking on different regions of the triangle buttons, indicated by blue shading in both images. The smaller the region of the button you select, the smaller the increment of movement.
The first image shows you side-by-side copies of the same X and Y manual control button, each with a different increment (in millimeters) selected for the X axis movement. The selected increment is the number in the center of each button.
The second image shows you side-by-side copies of the same Z axis manual control button, each with a different increment in (millimeters) selected for the Z axis movement.
Be careful when using the manual control buttons. If you double-tap the increment, you will move that distance twice with almost no pause in between each move.
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