First, select the View/Proof Setup menu. You will see several presets for common conditions.
The current preset, which will be the default if you haven't changed it, will have a tick against it.
You should use Monitor RGB.
A full list of the different settings and how they will display your photos are:
Working CMYK: This will be the CMYK printing condition defined in the Color Settings menu. That is the ICC profile, such as 'FOGRA 39', with the associated Rendering Intent, etc.
Working Cyan, Magenta, Yellow, Black and CMY, etc.: Displays individual or groups of colour channels using the working CMYK set-up. These proofs were known as 'progressives' in the industry a long time ago, and will be of little use today.
(Legacy) Macintosh RGB and Windows RGB: Displays images as a basic (non-calibrated) monitor might. Useful for checking images destined for the web, as is the more modern Internet Standard RGB.
Monitor RGB: Image displayed using your monitor profile and no further colour management.
Colour Blindness settings: How people with two of the common forms of colour blindness might perceive colour.
Individual Presets: Settings you have previously saved and named.
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