Sony ILCA-77M2 - Manual (Page 67)

Histogram
Level
For viewfinder*
* [For viewfinder] is displayed only on the screen.
Some display modes are not available in the default settings.
To change the display modes, press MENU →
(Custom Settings
) → [DISP Button] and change the
setting.
Note
Histogram is not displayed during panorama shooting.
In movie mode, [For viewfinder] cannot be displayed.
Hint
You can select different settings for both the viewfinder and the monitor. Look through the viewfinder
to set the display settings for the viewfinder.