Hi @ Francis Germain,
Thank you for posting in the community.
Here are the steps to set site storage limit to Automatic:
1, Go to Settings in the SharePoint admin center, and sign in as a SharePoint admin or global admin.
2, Click on “Site storage limits” ->set site storage limit to Automatic.
For more information about setting SharePoint Online site storage limits, see: Office 365: Managing Site Storage Limits in SharePoint Online - SharePoint Diary
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