Garmin G3X Pilot's Manual page 364

AFCS
If there is less than half-scale deviation when the AP NAV Softkey or NAV Key is
pressed, VOR Mode will activate (green text), intercept, and track the selected radial.
If there is more than half-scale deviation when the AP NAV Softkey is pressed, VOR
Mode will arm (white text) first, then activate when closer to the radial.
Navigation
Mode Active
Selected
Navigation
Source
VOR CRS
Softkey
Intercepting and Tracking a VOR Radial
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Garmin G3X Pilot's Guide 190-01115-00 Rev. K