Difference in colour shown

[defaultc5q6deuik4g6]

Dear community,

I am making a poster for print. And I have chosen a red in cmyk. Although as you can see on my screenshot- the red square in the bottom right corner- shows a completely different dull red that the cmyk i have chosen.
My work space mode is in cmyk. 

[Peter Spier]

You are using the RGB color picker and that bright red is out of gamut (cannot be produced) for cmyk inks.

[rob day]

Also, you can pick a red color that is considerably more saturated than the CMYK values you have entered—it’s the 13% cyan and 2% black that is dulling the CMYK color.

The appearance of a CMYK color depends on the document’s assigned CMYK profile—Edit>Assign Profiles.... Here I have Coated GRACoL 2006 assigned to the document with the CMYK values set to 0|95|90|0:

Adding 13% cyan, 2% black dulls the color appearance—it also changes the equivalent RGB values: