This question is in reference to Atlassian Documentation: Configuring plan settings
Scenario is a new feature of Portfolio for JIRA version 2.2, are you sure your add-on is in this version ?
If not you need to updated the add-on
The Atlassian documentation : https://confluence.atlassian.com/jiraportfolioserver/multiple-scenario-planning-868977946.html
Regards
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