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As the official documentation says, this feature cannot be turned off. This is by design.
Considering the impact of SharePoint link sharing permissions, it is recommended that you check the sharing permissions for SharePoint links if you are using a personal account. If you're a member of an organization, it's a good idea to contact your administrator to research sharing permissions to see if the link's permissions can be modified.
In addition, there have been user feedback that turning off the MailTips below may resolve it. Go to File > Options > Mail > MailTip Options.
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