Sony A7RIII ILCE-7RM3A Operating Instructions Manual page 341

Help Guide
Interchangeable Lens Digital Camera
ILCE-7RM3A
α7RIII
TC/UB Disp. Switch
Allows you to display the time code (TC) and user bit (UB) of a movie by pressing the key to which [TC/UB Disp. Switch]
function has been assigned.
MENU → (Camera Settings2) → [
1
the [TC/UB Disp. Switch] function to the desired key.
Press the key to which [TC/UB Disp. Switch] is assigned.
2
Each time you press the key, the monitor display will switch from the movie recording time counter → time code
(TC) → user bit (UB), in that order.
Custom Key], [
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Custom Key], or [ Custom Key] → assign