Hi Jaya,
This looks like a customized menu. This is managed by the organization, so you may want to reach out to the person who customized it.
If you would like to make the change, you either need to have access to the Report Suite Manager, or ask an admin to do the following:
Go to Admin > Report Suites > [Select the report suite] > Edit Settings > General > Customize Menus.
You should be able to change from there.
For more details read here: https://marketing.adobe.com/resources/help/en_US/reference/customize_menus.html
-Hyder