I think I have diagnosed the problem the problem is because of the bookmarks section. If I enable the bookmarks then the scroll bar appears. Hope you resolve the issue right now Anand Vaidyanathan and one more thing the scroll bar also appears when I click on the more option on the side bar.

I would love co-operate with you to tackle this bug. If you wish to have more data / information. We could have a meet. Feel free to message you. I am at your service.