why is my appscreen background color greyish?

[userZPf2zW65B2]

i have set black background color. its black on homescreen but greyish on appscreen. is it possible to get it black on appscreen too? the color difference is more explicit in phone.

phone: a40

One UI: 3.1

android: 11

[kylewright3091]

Launch the Settings app, and then select Accessibility.Select Visibility enhancements.Select Color adjustment.Tap the switch to turn off Color adjustment

[userZPf2zW65B2]

my Color adjustment is already disabled.