FujiFilm X-T2 - Manual (Page 278)

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The Fn (Function) Buttons
Assign roles to AE-L, AF-L, and function buttons
for quick access to selected features.
The default assignments are:
Fn1 button Fn1 button
Face/eye detection settings
Fn3 button Fn3 button
AF mode
Fn5 button Fn5 button
White balance
Fn2 button Fn2 button
Drive settings
Fn4 button Fn4 button
Film simulation
Fn6 button Fn6 button
Performance