TL;DR
When you pull a blueprint out of your blueprint library to place into the world, also put it in the clipboard so that if you cancel, you can get it back with Ctrl-V.What ?
Unfortunately it's hard to make pictures describing this, because it's all about the keyboard interface.Why ?
Often I go to pull a blueprint out and get ready to paste it down, but then realize I need to remove something or change something to make that blueprint fit. I cancel, then make whatever changes I need to, and then I have to go find the blueprint again. I have an extensive blueprint library now and it can take a few clicks and some scrolling to get back to it. For a big complicated blueprint where I'm changing a bunch of things out, I may have to pull it up 4 or 5 times before I get everything cleaned up and ready to place the new stuff down, and all that clicking into the blueprint library gets obnoxious. Sometimes I'll put a blueprint onto my tool bar that I only intend to use once, just so I don't have to go back in a bunch of times.A few times lately I have been confused that a blueprint I just had wasn't in my Ctrl-V history and then it hit me that I had pulled it out of my library instead of copying it from my world which was why it was missing. What I think would fix both of these issues is for a blueprint to enter that history when I select it. It seems like a simple common sense change that would make the blueprint library seem much less cumbersome.
Mine it’s not. I would not like to have my clipboard mixed up with things I already have elsewhere.