I'd like to warn users before sharing a file or a site to "Everyone" by showing a pop up. Is there a way to do this ?

Maybe by editing the master-page on SharePoint Designer ?

Thank you for your help.

1 Answer 1


The system sharing dialog box does not support customization.

So we couldn't add the prompt box when someone share files to Everyone.

  • Hi Julie, Thank you for your answer.
    – Mapow
    Dec 8, 2020 at 12:54
  • If you find any reply is helpful, please remember to mark it as answer.
    – Julie_MSFT
    Dec 9, 2020 at 1:10

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