Let’s see:
I open my folder, then my projects are listed in the left column, I mark a project, which then will expand its tasks in the right large column (landscape view).
So in the right large column there is the Project name on top,
and the tasks listed below, fine.
But where is the “edit button in the corner”, what I have is:
the search loupe, the eye, the plus sign and the inbox button.
The edit button is on the top left of your task list pane. 3 small lines with circles to the right. Let me know if you can’t find it and I’ll make a screenshot.