Garmin G3X Pilot's Manual page 336

AFCS
The flight director is automatically disabled if the attitude information required to
compute the default flight director modes becomes invalid or unavailable.
COMMAND BARS
Upon activation of the flight director, Command Bars are displayed in magenta on
the PFD. If the aircraft is being flown by hand, the command bars are displayed hollow.
The Command Bars do not override the Aircraft Symbol. The Command Bars move
together vertically to indicate pitch commands and bank left or right to indicate roll
commands.
Hollow Command Bars (Pilot Hand Flying Aircraft, FD Only)
If the attitude information being sent to the flight director becomes invalid or
unavailable, the Command Bars are removed from the display.
314
Autopilot
Status
Autopilot Manually Disengaged
Solid Command Bars (Autopilot Engaged)
Aircraft Symbol
Command Bars
Garmin G3X Pilot's Guide 190-01115-00 Rev. K