A very annoying feature, which is automatically on, is the Code Collapse for editing T-SQL code. I have complex code for which it rarely adds anything valuable. Also, I like to choose rows over on the left by the line numbering and was forever getting fouled up in the collapse boxes.
I looked many times in Options without discovering how to turn it off. Thank God I found this link where Buck Woody explains how to do it.
Just in case Buck’s post goes away I provide the magical invocation here:
Tools > Options > Text Editor > Transact-SQL > Intellisense > uncheck Outline statements
It takes effect without even having to reopen the tabs already opened.