Comment by russellbeattie
2 hours ago
It's almost as if neither of you wannabe pedants have a access to Google, or even an AI, which could help you out.
It's AP Style, which is used in basically every news article you've ever read.
The rule is simple: You capitalize the first word after a colon when it begins a full sentence.
This is unique to AP and 18th CMOS: MLA and old CMOS versions with grew up with say to do the opposite.
Also, please try to be less dismissive!