Open any release associated with a Product and try to view the Gantt Chart of the associated release, we see that the columns are not sortable nor we see an option to add sort on any specific column, refer the below URL for reference
Release or Environment
1. From application navigator, Go to Project Administration > Settings > Planning Console.
2. From default context, open Planned Task Console,
3. Choose the planning console display column you wish to make it sortable from the related list,
4. Add the sortable field to the checkbox and update it to checked.
The configuration is derived from the Planning console properties which is detailed in above and there is no direct option available on the Planning console.