It is not possible to rename the Report columns within Standard Report Types.
When creating a Custom Report Type (CRT), users are provided with the option to update the Display Label for any field that has been added to the CRT. Once the display label has been updated within a CRT, every new report that is created using that Custom Report Type will show the renamed labels. Refer to this article which outlines the steps in creating a Custom Report type.
Once a Custom Report Type has been created or identified, refer to the steps below to rename the fields in the report layout:
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