How to center title and set title font in a tcolorbox

Question

Please help me set a centered, bold, larger font size Title in tcolorbox:

mwe:

\documentclass{book}
\usepackage[most]{tcolorbox}

\begin{document}

\begin{tcolorbox}[colback=black!5,
    colframe=black!5,
    title={Top Title},
    coltitle=black, 
    fonttitle=\bfseries\Large, 
    sharp corners,
    enhanced,
    breakable,
]

  My box.

\end{tcolorbox}
    
\end{document}

Answer 1

halign title determines the horizontal alignment for the title.

\documentclass{book}
\usepackage[most]{tcolorbox}

\begin{document}

\begin{tcolorbox}[colback=black!5,
    colframe=black!5,
    title={Top Title},
    coltitle=black, 
    fonttitle=\bfseries\Huge,
    halign title=flush center, 
    sharp corners,
    enhanced,
    breakable,
]

  My box.

\end{tcolorbox}
    
\end{document}