Hello Stephanie,
As @kmeeusen says, this may be a browser issue.
However, at many schools, the Canvas team "hides" specific menu items from instructors (or students) in Canvas when it is a function that they don't want them to have access to. For instance, if your school has another way of cross-listing courses outside of the built-in tools in Canvas (like my school does), they may hide the "Cross-list..." option in the section menu.
Normally, such "hiding" is done with CSS formatting, and it sometimes takes a second for that to "kick in" in the browser window, so "hidden" items may be momentarily visible until the browser finishes rendering the page.
I would contact the Help Desk or Canvas Support team at your school, to confirm what method they want instructors to use when cross-listing classes in Canvas.
Mike
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