This setting controls whether the apps your already have present in Tomcat_home\webapps directory would be deployed when Tom The cat is started from IntelliJ idea.
By default this would deploy the Following:docs examples Host-manager manager ROOT
If you don ' t need any of these default apps or any of your other apps put there manually to be deployed, disable the D Eploy applications configured in Tomcat instance option. This'll make the server startup faster and it'll use less memory.
Documentation page you are are looking for are available here, which is the official explanation to this option:
The Tomcat configuration files, among other things, may list the applications that should is deployed at the server STA Rt. If This check box is selected, the applications so listed would be deployed on the server in addition to the artifacts Specified on the Deployment tab. If The check box is isn't selected, only the artifacts and the external resources specified on the Deployment tab would be de Ployed. Original: https://stackoverflow.com/questions/45666280/ What-is-deploy-applications-configured-in-tomcat-instance-in-intellij-2017-2