What is :bootRun tab??
已回答

When creating and debugging a Spring boot project, the: bootRun tab in the image always appears.
Is there a way to get rid of that tab?
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:bootRun is a tab that IDE creates for the java process debug that was launched by corresponding Gradle task. Essentially, this is the tab for the Remote Debug configuration (which is automatically created when you launch Gradle task in Debug mode). See also this comment for more details.
We plan to address some related usability issues: https://youtrack.jetbrains.com/issue/IDEA-200694