Garmin G500 Pilot's Manual page 109

Class C/TCA Airspace Viewing Range
The Class C/TCA airspace viewing range option selects whether Class C/TCA
airspace information is shown on the Navigation Map. Class C/TCA airspace
information will be shown at and below the selected map range. When Off is
selected, the information will not be shown. In the example below where 200
NM is selected, Class C/TCA airspace information will be shown at map ranges
of 200 NM and lower.
Figure 3-57 Navigation Map Class C/TCA Viewing Range Selection
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190-01102-02 Rev. E Garmin G500 Pilot's Guide