Hi, I am having similar issue, some screenshots below:
1) first screen when overlay is not visible

2) I click on the "FLOWER 2" bar and the edit-pane slides in which is part of the overlay, and overlay covers the entire screen as below


3) Now want to come out of the edit-pane which is accomplished manually by clicking on the left side of the edit pane, i.e. the part where it still shows the previous screen (Flower 2). But using selenium, trying to click on the left side clicks on the overlay, could not close this overlay. Any help is appreciated.
Thanks,
Pratibha