There are many improvements in the new Acrobat that are great. If I disable new Acrobat to avoid the things I don't like about new Acrobat, I quickly miss the improvements. Therefore, disabling "new Acrobat" to avoid new design that I don't like is temporary at best because it is inevitable that the "old Acrobat" option will disappear. Here are a few things I would like to see improved in new Acrobat.

It would be nice if the current tab color contrasted more with both the surrounding interface and other open tabs, but that is true in "old Acrobat" as well.

The "plain vanilla" black & white tool icons in the taskbar on the left (the "All tools" panel) and the icons in both the left and right panels need color because the icons are not readily distinguishable. Finding the correct tool is visusally fatiguing and gets more frustrating the longer you work in Acrobat on any given day.

The reduced customizability of the toolbars in the new Acrobat is a step in the wrong direction. In the "old Acrobat" the toolbar across the top was extremely customizable for the way I use Acrobat, and I miss that.

Finally, please restore first-page / last-page arrows adjacent to the page up /page down arrows in the quick access right hand panel.