Sony FX 6 Quick Start Manual page 86

Focusing: Manual Focus
In Hybrid mode, simply turn the
focus ring on the lens to begin
focusing manually.
There are two aids to help.
Button 7 on top handle enables the
focus magnifier in the VF. Push twice
to increase magnification.
The Focus Peaking button is on the
side of viewfinder (VF), if you prefer
that aid.