Slide Over Content not working

Hello,   I am trying to add “Slide Over Content” option to my toggle region sidebar. But it is not showing the side bar when clicked on the toggle button. Other option “Push Content aside” when used, i am able to see the side bar with contents of the page pushed to the side. Any idea why this issue is coming? as it seems like functionality “Slide Over Content” is broken. Any help to achieve my requirement would be appreciated.   Thanks, Guru
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