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Checklists can be displayed in three different display modes: Custom Field, Independent Panel, and Sidebar Panel. For more details about each option, see https://okapya.atlassian.net/wiki/spaces/CHKDOC5/pages/1951563865.
To display a checklist in the sidebar:
Edit the parameters of your checklist (for details, see https://okapya.atlassian.net/wiki/spaces/CHKDOC5/pages/1966112870).
In the Look & Feel tab, in the Display mode drop-down, select Sidebar Panel and click Save.