Acrobat: How to pin the Page Thumbnails screen?

Really getting sick of Adobe either hiding this feature from version to version or removing it and bringing it back.  To me this seems like it should be a standard feature since if you have the version of Acrobat that can edit PDF files you'll probably be moving pages around and/or adding them.

Basically I want the "Page Thumbnails" plane to stay open permenantly.  No matter what file I open (a new / never opened file, something I worked on, an online PDF, etc, etc) I want to see the "Page Thumbnails" screen opened automatically every time I open a PDF.  I do not want to click on anything on the left side of the screen to open this plane manually.  

In one of the previous versions I had, the "Pin Thumbnails Plane" option was in a drop down menu directly below the "Page" heading when the "Page Thumbnails" plane is open.  I got a new computer and re-downloaded Acrobat and now I have Adobe Acrobat Standard DC Version 2019.021.20061 and this option is not there anymore.  Anyone know where Adobe hide this feature in their latest version?

Thanks in advance.

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