As a Roblox developer, it is currently impossible to configure Studio to open Find All results in temporary tabs while opening Quick Open results in regular tabs. This is because the setting that controls both of these is a single setting:
My reasoning for wanting to do this is because when I open a script with Quick Open, I am deliberately opening it to analyze or edit it and I don’t ever want it to disappear as soon as I change tabs. On the other hand, I use Find All to skim through the results until I find exactly what I’m looking for and I don’t care about the irrelevant results.