How to select multiple name lists in name generator?

In the old name generator, I could “select all” or deselect all. I can’t find a way to do that now and need to click on name lists individually to add them one at a time. Is there a trick I’m missing?

Yes, as is often the case with series of checkboxes, you can hold down the Alt key when clicking on one of them to toggle all of the rest in a logical way. If the box you click on is not ticked, then all will be ticked, and vice versa. So it’s easy to switch between a few regional lists and everything.