If using a PC with NVidia graphic cards, hardware acceleration is automatically deactivated if protected mode on startup is active. This slows down 3D PDFs significantly.

Deactivating Protected Mode on Startup allows for hardware acceleration again.

The Reader app (all platforms) should be more generalized to allow "reading" of both EPUB or PDF documents.

Similarly, we should be able to embed an EPUB into a PDF file. (PDF has a robust method that allows it to embed other file formats.)

Then, we should have a switch in Reader that would let a user to switch from PDF to reflowable EPUB and back again.

While I understand that Adobe is investing heavily in Liquid Mode, this EPUB method would be far more reliable for people who need to control the design of both static and reflowable modes.

The collapsed Right Tool Pane violates usability principles. To quickly scroll a page, users can no longer just drag the mouse cursor all the way Right, to click on the Right scroll bar. This would probably take only 1 sec. With the annoying Right Tool Pane collapsed, nesting right beside the Right scroll bar, users must now carefully drag the mouse cursor, take aim so-as-to not click on the Right collapsed pane, then can he/ she click on the right scroll bar. This is really slow and inefficient.

The DFS bug has shown it's head again. Win 2019 servers offering DFS fileshares to Win10 clients will no longer allow multiple PDFs to be opened from the OS interface, because of Protected Mode.

Any other combination works fine (non-Win2019, non-Win10, non-DFS shares, disable Protected Mode).

Now that the vastly popular Win 2008r2 is out of support, many more organizations are upgrading to Win 2019. Disabling Protected Mode via registry GPO is a poor workaround.

Please fix!

When multiple documents is opened in multiple tabs in Acrobat Reader, and when hover mouse over the Reader icon on the taskbar, it shows multiple windows in preview instead of one window. It would be a good thing to add that as a option so that behavior is similar as Google Chrome or Mozilla Firefox which shows one window and active tab instead of multiple windows in the taskbar. It is really struggle to deal with multiple documents and when you want to restore minimized Reader window to the last opened tab.

Please make an Always Show Comments Bar option. I work with the stamp, shape and text box tools on many PDFs daily. I have to open the comments toolbar for each one of them. While it's a small thing to do on one PDF, it gets old fast when it must be done for each of many PDFs every day.

Allow the ability to sync Adobe Document Cloud to your machine, similar to Creative Cloud.

It is very inconvenient and time consuming to make multiple clicks in order to zoom in or out the document. In the older versions they were separate and easily accessible. Drop down menu style is really exhausting and time consuming for these kind of basic operations. Please separate the zoom buttons !

Get rid of the tools pane by default. No one I have ever met wants it there by default. Please get rid of it.

Fix this:
https://community.adobe.com/t5/acrobat-reader/adobe-reader-dc-language-pack-fro-version-2020-006-20034/m-p/10945869?page=1

Need a new installer!

Clients with Windows 10 1809 or more (or Win2019) trying to access a PDF via a DFS that is stored on a Windows server 2019 server are not able to open more than 1 pdf.

Can this please be fixed as Windows Sever 2019 is being used more widely.

If you have multiple pdf open in tabs, one button to save them all into a single folder

It would be useful to have arrows like in web browsers to move smoothly in documents with cross-references and bookmarks.
I am a latex user and often in pdfs produced by latex for scientific documents there are hyperlinks for equations, figures and bibliographical references in text. It would be useful in reading, once you have checked the reference to be able to go back.

Almost all other file cloud sharing and editing programs including OneDrive are able to create a cloud files access folder on the directory of the computer itself. They have had it for a while now and it is time that Adobe include have the same feature for Document Cloud. This can can clearly be achieved and should be included in an update considering the price paid to use this service. Thank you.

SUGGESTION
With the current version (2020.006.20034), these can be hidden but for the current session only. Put an option in settings to hide these interface elements globally.

WHY THE FEATURE IS NEEDED
To maximize vertical screen real-estate; as most of the devices these days are shipping with widescreen displays.

Could you please allow users to pin one or both of the above options to the tool menu, or the top ribbon, to allow one-touch use of this feature. It's such a commonly used feature to be buried under 2+ clicks.