a13: Focus Peaking
G button U A Custom Settings menu
When focus peaking is enabled in manual focus mode, objects that are in focus are indicated by colored outlines in the display. You can choose the color.
Select [ON] to enable focus peaking.
Choose focus peaking sensitivity from [3 (high sensitivity)], [2 (standard)], and [1 (low sensitivity)]. The higher the value, the greater the depth that will be shown as being in focus.
Choose the highlight color.