Reader v21.001.20135. I've seen this on multiple computers owned by multiple different people. This version of Reader appears to be ignoring the following setting in Preferences, "Documents | Open Settings | Remember current state of Tools Pane" Regardless of the state of the Tools Pane and the box is checked, Reader keeps opening with the Tools Pane displayed.
Sorry for the Inconvinience caused at your end. we tried the same workflow at our end but are unable to repo the issue. Could you please help us with the screen recording of the issue do that we traige the issue better.
Hope you are doing well and sorry for the trouble. As described, Reader appears to be ignoring the following setting to ''Remember current state of Tools Pane"
Please try to reboot the computer once and see if that helps.
If it still doesn't work, please try to repair the installation (Windows Only) Go to Help > Repair Installation and reboot again and check.
If it still doesn't work, please try to reset the Acrobat preferences to default as described in the help page https://community.adobe.com/t5/acrobat/how-to-reset-acrobat-preference-settings-to-default/td-p/4792... and see if that works for you.
Rebooting, running the repair, nor a clean install fixes this same issue for me. I noticed after the clean install that the ''Remember current state of Tools Pane" box unchecks itself once you close the program. It remains checked once you select it until you close the program.
Adobe Acrobat Reader DC Version 2021.001.20138
Windows 10 Pro Version 10.0.18363 Build 18363
If after following the babove step still issue is repro at your end Please provide the below info to triage the issue at our end.
you can goto Registry Editor, then Computer\HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\, Right Click on "DC" and export
Please feel free to reach out in case of any query.
Unchecking the "Compatibility mode" setting fixed my Tool Pane issue (thank you). I am working through the same for the Navigation Pane on another Adobe support thread and so far no success with those recommendations. Fortunately that pane only opens automatically for certain files and not every one.