This may be good highlights on working with sessions:
https://confluence.atlassian.com/display/BONFIRE/Advanced+ways+to+work+with+Test+Sessions
https://answers.atlassian.com/questions/34766/how-to-enable-test-session-tab-for-certain-issue-types
If "Test Sessions" is Bonfire, you should be able to disable the add-on module.
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