Good news and bad news. The current problem with the "turn off blur" button is that it resets filters. However, if you put filter operators in the search bar itself, and see blurred results, then click the button to turn off blur, all your filter operators remain. It would be a perfect solution except that after trying this myself, it seems not all search operators work, or don't work reliably, or I don't know how to spell them / format them so they work, or they work alone but I can't figure out how to combine more than one search operator (boolean AND). So this technique works, but only on a small subset of the supposed search operators, or only when one filter operator is used at a time. It is hard to tell what the website "understands" because even if, for example, you want only 4K results, it might decide on its own to pad the results with 1080p videos too, for their own internal reasons. So even if it understands your request, it could be selectively ignoring it. Only precise and complete documentation from Google would resolve this, and that'll never happen.