There have been some recent additions to the toolbar controls for the Query block. Before we go too far, let's evaluate what we have currently.

Posts per page
This is an important setting, however, will the Query block every produce results that include anything other than posts? My suggestion is to change this to say, "Items per page" and make sure it is in Sentence case, not Title case.

Number of Pages
I think this one can change to a toggle that says, "Show more than one page". The reason being is that the current "number of pages" doesn't allow a default that just shows however many pages are required to display all the posts. And it seems likely that users will want to only show ONE page with a few results, or show ALL pages with a set list of results per page. Of course toggling this "on" would add the Query Pagination block automatically if needed.

Offset
This is good to keep, but needs some explanation (helper text). At first I wasn't sure what this did. Can we add some text below that offers a tip? "Offsetting a list to 3 will begin the results at the 3rd item instead of the 1st."

Categories & Tags
I like that these are added for the basic Query block, but I imagine they will be hidden depending on the template for which they're being used. Like if this block is used on a category-$slug.php page, I would assume the Tag settings would not be available. Nor would the Category settings be available because the template would pass the parameters directly to the block. Am I thinking about this correctly?

Add "Order by" sorting
Let's add the "Order by" sorting option to this list as well.

New mockup

With these design changes, the toolbar popover should look something like this:

cc @ntsekouras