Follow the steps below to Bulk Change Issues in Jira

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Go to Projects > Open a Project > Click on Backlog > Select Issues (Shift key + first and last Issue if they are in sequence OR Control/Command key + left mouse click on Issues)
Once you have selected the issues, Right-click on mouse> Click on Bulk Change > Select an Action/Option from the list > Click on ‘Next’ button > Choose a/an Option(s) from the List > Click on ‘Next’ button > Click on ‘Confirm’ button > Click on ‘Acknowledge’ button.