FujiFilm X-H1 Owner's Manual page 104

Focus and Exposure
Select focus mode C to vary focus with shot; to vary exposure with each
shot, select OFF for D BUTTON/DIAL SETTING > SHUTTER AE.
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Selecting CH in focus mode C restricts the choice of focus frames.
Exposure and focus tracking performance may vary with such factors
as aperture, sensitivity, and exposure compensation.
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Continuous Shooting (Burst Mode)