Hiding 'tools', 'comment' and 'sign' buttons in Adobe Reader XI
Solution 1:
In adobe reader installation folder (typically C:\Program Files (x86)\Adobe\Reader 11.0) Find the sub-folder Reader\Services.
Remove files "DEXEchoSign.spi" and "DEXShare.spi". (Adding .bak extension, or changing extension, is sufficient. Only renaming will not work.)
This removes the Tools and Share toolbar options. I have not found a way to remove "Comment" yet.
This question is a duplicate of (Delete "Comment" and "Share" buttons from Adobe Reader X toolbar) but there seems to be a different answer accepted there.
Solution 2:
I guess that annoys you the loading time of that right tools column. It annoys me too!
My solution is: It is actually a toggle button. Click again on the same Tools or Sign or Comment (i.e. the one highlighted) and it will hide it.
Now, the pdf will load faster. It is ok for me like that :)