Whenever I click on SYSTEM PREFERENCES icon at the bottom of my Desktop, instead of System Preferences, the iCloud Preferences Window pops up on my screen.....
Any idea why this is happening?
How can I fix this?
Mine does that too. I just click the Show All button and move on.
To be pedantic, that iCloud Prefs window is part of System Preferences.
Does the System Prefs icon have a notification number (red) on it? iCloud in SP wants you to complete something. It will ask you for Apple ID (or Admin .. I forget) ... enter it, then click back to main SP menu and close. You should be ok after that.
Well, yes, mine does. Probably why the OP is seeing this come up first also.
But, it's not asking me for an ID. The alert at the top is about 2-factor Authentication. I'm not going there again, so I'll make that extra click when I need to check something in SP.
Edit: So I clicked the Continue button in the Alert, and it went away. It didn't want a password or anything else to set up 2FA. Going to Show All and closing has "fixed" the "problem". I imagine the OP can do the same.