How to stop Google Photos from launching at system startup?

Google Photos starts every time I turn on my Macbook Pro. It is annoying and I believe it slows down the OS' startup speed. Is there a way to turn the launch at startup option off? I do not see it in Google Photos' preferences. It seems the only option is to uninstall it:

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If it's listed in System Prefs > Users & Groups > [yourname] > Login Items,
select & hit the minus sign - underneath.