Sony ILCA-77M2 - Manual (Page 42)

You can register frequently used functions to the Fn (function) button and recall them while shooting. Up
to 12 frequently used functions can be registered to the Fn (Function) button.
1. Press the DISP button, and then press the Fn (Function) button in a screen mode other than [For
viewfinder].
2. Select a function to be registered by pressing the up/down/left/right side of the multi-selector.
3. Select the desired setting by turning the front dial, and press in the center of the multi-selector.
Some functions can be fine-tuned using the rear dial.
Performing settings on the dedicated screen
Select the desired function in step 2, then press in the center of the multi-selector. The dedicated
setting screen for the function appears. Follow the operating guide (A) to perform the settings.