Excel Services global settings - SharePoint 2013

1.   On the Central Administration home page,

2.   In the Application Management section,

3.   Click Manage service applications.

4.   On the Manage Service Applications page

5.   Click the Excel Services service application that you want to manage.

6.   On the Manage Excel Services page, click Global Settings

7.   On the Excel Services Application Settings page, update the settings that you want to change, and then click OK.