At the bottom right of the back of the X-PRO2 between the DISP/BACK button and the D-PAD there’s the indicator lamp.

X-PRO2/X-T2 indicator lamp

Indicator Lamp What does it mean
Continuous green Focus locked
Flashing green Focus warning: you can still take photos (same flashing green as exposure warning)
Flashing green Exposure warning: you can still take photos (same flashing green as focus warning)
Flashing orange then green Normal: saving the images to the memory card
Continuously orange Busy saving the images to the memory card, the camera is locked until the operation has release enough memory to continue.
Flashing red Either a lens error or a memory error