How to open Sony ax33 viewfinder?

1. First, set the viewfinder/monitor to the display screen under the gear menu on page 4 (manual).

2. Enter the custom button (shooting) under the gear menu on page 7.

3. Select what you like (I selected the custom button 2, which is C2) and set it as viewfinder/monitor selection.

4. Manually switch between the viewfinder and the display.

5. The default boot is the display screen. Press C2 to switch to the viewfinder, and then press C2 to switch back to the display screen. If you don't press C2, you will never change it automatically.