I found what appear to be a couple of bugs. I'm running the latest Acrobat DC and v12.81.
1) The "layout" (or was it "visibility"?) text tag for the first button on the JavaScript toolbar disappeared in v12.81.
2) If I unselect Companion page from visibility, it is still visible.
3) When I go into Sources and remove PHB version of Ranger under Classes, it appears to work. However, if I then open the dialog again, the PHB Ranger is back under the "included" column.
4) Import from PDF seems wonky. At the top, it says "Add a JavaScript file to your Acrobat installation or use the Console" and I don't see anywhere to select a PDF. Did the wrong window get linked from this option?
Thank you for reporting any bugs you found!
Great that you numbered them, then I can respond to each easily.
1) The text being visible in the 'JavaScript Window' is determined by Acrobat and is dependent on the width of your screen. Below a certain number of pixels, Acrobat will only show the icons for the buttons, not the text. It will start by removing the text from the button on the left, and removes the text from as many buttons as it deems necessary. For example, on my laptop it removes the text from the first two icons. So this is not a bug, but normal behaviour for Acrobat.
2) I am unable to replicate this issue. Can you give some more information what is happening exactly? Note that if you created multiple companion pages, unchecking it from the layout menu will only remove the first companion page, and none of the others. Also, know that the colour of the bookmarks can only be changed on Adobe Acrobat Pro or Standard, as Reader doesn't allow changing of the bookmarks via JavaScript.
3) Again, I am unable to replicate this issue. Note that the things you are moving to included or excluded are actually the subclasses. So if you open the window again after you have changed the subclasses that are available, there can very well be some subclasses that are new and added to the included window. For example, if you open the classes & archetypes dialogue and exclude the ranger and click "apply" to submit these changes, but then in the parent dialogue include a Unearthed Arcana source like "UA:RnR" that introduces new ranger subclasses, the classes & archetypes dialogue will put these new subclasses in the included sections, while still having all the subclasses you previously excluded in the excluded section. Another thing that might be going wrong, but I doubt it, is that you close the dialogue with either the "cancel" button or red X on the top, which would cause your changes not to be applied.
4) When you select the option to "Import Directly from PDF" you are supposed to see the dialogue that reads "Add a JavaScript file to your Acrobat installation or use the Console". The first paragraph of that dialogue is supposed to explain the reason, and it reads as follows:
"In order to use the 'Direct Import' functionality, you will need to do something to appease Adobe Acrobat's security settings. You have two options:
Option 1 is that you add a JavaScript file to your installation. After you've done this, you will never see this dialogue again.
Option 2 is that you run the code from console, but you will have to do this every time if you want to use this function."
From your reaction I get the idea that you didn't read this far, so that is why I posted it again. I hope this explains it. If however I am wrong and the dialogue is not showing correctly, please let me know and we can find the bug that is causing this issue.