bookmarks
Don't open bookmarks by default!
When opening a document that has bookmarks embedded in it, the bookmarks panel opens automatically (and slowly) and takes up a third of the screen. It's infuriating, takes several seconds before it can be closed, and is completely pointless. Ditch it, or make it take up a tiny fraction of the screen space. I hate the way Acrobat prioritizes bookmarks over every other aspect of the interface.

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Erik commented
I use this feature all the time, Under File>Properties>Initial View to enable or disable Bookmarks Panel + Page when sending large documents to clients. I want my clients to have easy access to my navigation links. When I send a document that requests bookmarks to be opened, I like that they will show up in adobe reader automatically.
I believe you can fix it on your end if you hate it by just setting initial view not to pop up the bookmarks panel... -
Juan Robles commented
Major annoyance, completely unnecessary, and time consuming to remove each time I open a PDF. Please remove this as a default. Or at least allows us the option to toggle this "default" on/off.
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Ana K commented
Yes, this is driving me crazy. It seems that the comment panel can be turned off universally, so why can't bookmarks? These should be simple user options. Agh!
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Matthew Baker commented
Couldnt agree more. The fact that this feature is a default option that cannot be overridden, except on a per document basis, is obscene and unnecessary.