I'm a regular user of Advanced Search. I find it frustrating in the New
Experience because it is no longer a persistent screen of its own. It's
now more of a popup on top of other screens, and the problem is that it
disappears on you when you do something like editing a view. e.g. I
spend quite a while setting up a complex set of filters to find the data
I'm interested in, and then I realise that I need to add a field to the
view. I do that, click Save and then BAM! The search results disappear
...