Hi @Borsoi Emanuel,
Thank you for posting in the community.
As per my knowledge, this tab is due to the addition of a PerformancePoint Services service application to your SharePoint.
Please go to CA->Application Management ->Manage Service Applications, check if you have added this service application.
Please check this service application with your administrator and ask him to delete it if it is not needed. Please refer to this article to remove the service application: https://learn.microsoft.com/en-us/sharepoint/administration/delete-a-service-application
If it does not affect your normal use, I think it can be ignored.
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