Question about Codedeploy Revision Location history manage

When i want to use Codedeploy to release a app in EC2,Everytime I need to choose a revision from S3.But there are many deployment in the same application.The S3 revision location where i click the blank box ，it will display the revision address of all deployment under the same application。It is easy to choose a S3 revision of other deployment.
Q1.How to manage the S3 revision location recommend option.
Q2.The same question to switch role history.