Additional features, settings, or issues not covered by specific Microsoft Teams categories
Dear @KawamuraNaohiro,
Based on your description, there is currently no supported administrative method to hide or disable the Files tab in the standard Microsoft 365 profile card or Org Explorer experience. Microsoft's profile card customization capabilities are limited to profile attributes and contact information, and do not provide controls to remove built-in tabs such as Files
This means there is currently no documented option to disable the Files tab:
Tenant-wide
For specific users or groups
Via Microsoft 365 admin settings
Via SharePoint Online settings
Via Microsoft Graph profile card customization
If this functionality would be valuable for your organization, I recommended approach is to submit feedback through the Microsoft Feedback Portal or the feedback options available in the Microsoft 365 admin center. The product team is in charge of the site, and they constantly check customer reviews and feedback. the higher votes, the more attention the related team will pay on and a lot of the features are developed and improved based on customer feedback.
For reference Enriching and customizing your organization's profile cards
I hope information above meet your expectations, please feel free to reach out if you have any other questions.
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