FujiFilm X-S10 Mirrorless Camera - Manual (Page 277)

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Function Controls
AF-ON
Controls to which AF-ON is assigned can be used for autofocus.
MODELING FLASH
If MODELING FLASH is selected when a compatible shoe-mount-
ed fl ash unit is attached, you can press the control to test-fi re the
fl ash and check for shadows and the like (modeling fl ash).
TTL-LOCK
If TTL-LOCK is selected, you can press the control to lock fl ash
output according to the option selected for F FLASH SETTING >
TTL-LOCK MODE ( P 149).