hsuanxyz opened a new pull request #3584: [ZEPPELIN-4530] Support versions switch URL: https://github.com/apache/zeppelin/pull/3584 ### What is this PR for? Add the versions switch button in the top drop-down menu ### What type of PR is it? [Feature] ### What is the Jira issue? https://issues.apache.org/jira/browse/ZEPPELIN-4530 ### How should this be tested? N/A ### Screenshots (if appropriate)  ---  ### Questions: * Does the licenses files need update? No * Is there breaking changes for older versions? No * Does this needs documentation? No
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