It’s been a while since “treeview” experience had been added in the preview portal:
Now we can also see “hidden” elements in the form designer! Classic designer had some nice stuff, after all, and now those features are making their way back into the new designer.
There is “created by” on the form below, but it’s hidden:
I can now flip “Show Hidden” to “On”, and there we go – the field becomes visible in the designer:
PS. Make sure you are using “preview” version of the designer if you wanted to try it for yourself (so, just add “preview” to the url: make.preview.powerapps.com)