You can delete applications that will not be used.
Log on to the Container Service console.
Click Applications in the left-side navigation pane.
Select the cluster where the application you want to delete resides from the Cluster list.
Click Delete at the right of the application you want to delete.
A confirmation dialog box opens. Click OK.
Note: Select the Remove the Data Volumes check box to delete all the data volumes related to this application. The named data volumes cannot be deleted.