Hello,
I was following this tutorial, and I noticed that when I created a hierarchical sheet it does not appears in the project browser (like at 1:40 in the video), neither does the "multisheet-cache" file. Is this normal with KiCad version 6.0.1? Hierarchical sheet works fine in my project, and the files do exist in the project folder.
It's kind of a bummer not to see which sheet you have in your design at first glance in the project viewer.