I always use ctrl + f to search in document and ctrl + shift + f to search the entire solution.
I find that its intermittent (but more often that not) and that its a potential bug. For me it resets to "All Open Documents" which could be far more disastrous.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.