I slightly second @Alice-chan comment.
Looking at screen. (Mine is 24’ @1080p monitor)
Then those settings button tab vertically gives slight uselessness. It would work better on the top right. But I think this is a really minor thing.
I think the cooler thing would be that the user can move right side part manually, not with that button that hides it completely.
Even more, cooler thing (that’s probably viable for minority people like me) who have multiple displays can, detach right side completely and move it to other display. Currently one can manually stretch it, but left side won’t be full screen then.
Here is a weird example of CSDIE stretched to two monitors. Where the left side text is on one monitor and the right side settings window on another.