Garmin G500 Pilot's Manual page 185

Freezing Level Viewing Range
The Freezing Level Viewing Range option allows you to select the map range
where at and below that value Freezing Level weather products will be shown
on the selected MFD Wx Data Link Map page (1, 2, or 3). When Off is selected,
Freezing Level Data will not be shown. In the figure below where 200 NM
is selected, Freezing Level data will be shown at map ranges of 200 NM and
lower.
Figure 4-48 Freezing Level Viewing Range Selection
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190-01102-02 Rev. B Garmin G500 Pilot's Guide