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I love new features, don't get me wrong, but not at the cost of them cluttering up the UI with features I rarely (or never) use. The sidebar on the web keeps growing with no way to tame it. How about...
This problem has a relationship to the font scaling on the user's device. Any users who need larger fonts scale up their default font size, and that makes the sidebar intrusion dramatically worse. Young users with 20/20 vision can use factory default font scaling, and see enough of the center pane to live with the annoying sidebars, But older users and anyone who needs to set the default fonts larger will hit the problem I illustrated above in February 2020.
My laptop has default font size set to 114% of normal. And you see the useless center pane that results from that.