Sony ILCA-77M2 - Manual (Page 21)

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Using the In-Camera Guide
You can use [Custom Key Settings] to assign In-Camera Guide to the
desired button.
The In-Camera Guide displays explanations for the currently selected menu
function or setting.
1
Select MENU button t (Custom Settings) 6 t [Custom
Key Settings] t desired functions assigned to the button t
[In-Camera Guide].
Press the MENU button and use the multi-selector to select a MENU item
whose explanation you want to read, and then press the button to which [In-
Camera Guide] is assigned.