Leica DFC Series Manual page 22

 Click Update to apply the values displayed but keep
this panel open, or click OK to close it.
Be aware that the range of some of these values is not
linear and will round up or down in practice.
You can also open this panel by right-clicking in the
basic function area of the upper control panel indicated
by the red outline below:
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Leica DFC Cameras – Image Acquisition Guide