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Yes, you can comment out several lines at once by selecting them and pressing Ctrl-/ (slash) (command-/ on a Mac). If you're familiar with vi or vim editors, you can also enable vi editor mode on Overleaf and use the standard vi commands for commenting. Finally, if you'd like to add a block comment in the source you can also use the comment package to comment out large sections of text. Just add

\usepackage{comment}

to your preamble, and then use

\begin{comment}
...
\end{comment}

in the text to create a block comment.

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