Trouble with new Adobe Acrobat Interface

I've been working with Adobe Acrobat PDF files since it first came out as a file format... not to date myself. I have to say this latest user interface is the worst. I typically do NOT complain about software and even suggest people use 'real' Acrobat over third-party substitutes. The re-learning curve is steep and has wrecked all my efficiencies I had built up, at work.

Here is a screen capture of the version I have installed:

I need help with modifying the interface. I'm hoping someone can advise/help, and I'm going to start with the request on how to modify the 'tool column' on the left had side of the screen. I've got a second screen capture below, and I've copy-pasted the text I have in that screen capture, as follows:

"I preferred this to be on the right-hand side like it used to be, but I’ll ignore that for now.

I’d like it to return to the days when the column of tools could be re-sized... right now, one can only click the ‘x’ for open or closed, and thus it uses up way too much screen real estate, not to mention one ‘looses’ use of the tool when you click ‘x’ to close it to get back more screen real estate. 1

I’d like to return the days when I could add/remove shortcuts to the tool bar - how do I do that now? I can’t figure it out. That list is way too long - typically I use about half-dozen of the tools.

How do I turn off the display of that floaty tool bar? I want it gone from the screen - again, takes up screen real estate. 2"

Many thank in advance to anyone who can help bring about these 'corrections' ... is what I would call them. 

Cheers,

Kristine

P.S. Message to Adobe: To re-iterate, I REALLY do NOT like this new interface at all, Adobe 😞

P.S..S. It has occurred to me that perhaps Adobe is attempting to bring Acrobat 'inline' with all its other applications, as far as user interface is concerned.  However, Adobe, if it's not broke, why fix it??? If you want to bring in new features like the AI Assistant, etc., fine, but leave the interface alone... it was working well. I'm now having challenges with simple tasks like printing, just to name one example, I keep doing THAT wrong... I could go on and on about the negatives of this new fangled version.... blech.