Slight blue shade on my MacBook Pro
This is either a colour profile or possibly a hardware issue.
It may also be a True Tone or Night Shift issue [though I've never had a Mac that can use those so I've no experience with them].
Your screenshot does not show any colour cast at all and 'white is white', as in this image showing the Digital colour meter over your screenshot (whether or not you see it that way, that's what the numbers say.)



First check the Apple KB links above to make sure it's not True Tone/Night Shift.
If neither of those is the cause, then either someone/something has changed your screen profile… or you have a hardware issue.
System Prefs &gt; Display &gt; Colour
Check what profile is shown as in use.
Check other profiles to see if they all show a similar colour-cast - some will look OK &amp; some will look awful, but you need to determine if it's always 'too blue'.
If most profiles show the colour is 'balanced' if not 'good' then you could try re-calibrating your display by eye.
To the right of that control panel is Calibrate…
Hold  Opt ⌥  as you click it &amp; it will open with the Advanced parameters as an option. Check 'Expert Mode' &amp; work your way through the following screens, adjusting each as best you can all the way through.
If all your efforts come out blue no matter what you do, then suspect a hardware fault &amp; take it to Apple.