If you go into General configuration > Custom HTML, you can hide objects on pages across the entire Confluence platform. I do not have the "Export to CSV" option but I do have the "Export to Word" option. To remove this, I did the following:
If you don't know the name of the option, you could drill into the Elements of the page using F12, and going into the <div section that contains the action name. I would assume your object name is "action-export-csv-link" based on the naming convention that Atlassian uses.
I hope this is helpful!
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