By default, when exporting data to Excel, the exported data would just have the column headers and the report data below each of the respective column headers. Thus it is not clear which report the data was exported from, for what date range and with what filter settings etc.
To include the report header in every Excel exports, enable the format option in the report settings by following the steps given below:
Click the Settings button on the report page, the Edit Report page appears.
Select the Format tab.
Put a check mark beside the first option on this page, Include report header in Excel version.
Click the Save button at the bottom.