The new linking dialog is terrible. 90% of the time our goal is to link to other articles in the KB. But now you've buried the search field for existing articles in a way that requires many scrolls and mouse-clicks to execute. Please revert this regression in UX.
FWIW, nobody is ever going to actually use that drop-down selector control you added in this new change. It's a useless addition in its current state. When you have hundreds or thousands of articles in a KB, a UX pattern like that is completely worthless.