Sony Cyber-shot DSC-RX100 IV - Manual (Page 29)

2. Grasp both sides of the eyepiece
(B) and pull it towards the monitor side until it clicks.
3. Slide the diopter-adjustment lever.
Hint
To store the viewfinder
Grasp both sides of the eyepiece and push it into the viewfinder until it clicks. Then push
down the viewfinder.
Note
Be careful not to push down on the viewfinder when it is being raised.
Be sure that the eyepiece is stored in the viewfinder unit before attempting to push down
the viewfinder. If it is not stored and you try to force the viewfinder down, a malfunction
may result.
Do not carry the camera by the viewfinder.
[7] How to Use Before Use In-Camera guide
About the [In-Camera Guide]