I'd like to list all user profiles along with their info on my site. I first use Views block tool to build a view on a page - with this method, Users option is not available under Content Selection (screenshot.)
Alternatively, I create another View using Class Editor. With is method, the system shows the Users option (see screenshot.) When I go to page edit and select Views Block, my user profile view is not showing up under Use Existing Views list.
Lastly, in page edit mode, when I select Classic block and hit the Views icon on the toolbox bar, there I can find my user profiles view with the popup window showing all available data fields and views.
I wonder if this is a bug, a glitch, or a limitation?
Blocks currently doesn't support taxonomy or user Views, you need to use the legacy editor for this.
The View block doesn't even support inserting existing taxonomy or user Views made with the legacy editor, it really only works with post Views.
You can insert such a View in a page/template made with Blocks. You can insert a Classic block where the Fields and Views button is available (with the Toolset icon) which you can use to insert such Views. Or if you are familiar with the format, you can enter the shortcode to insert the View directly in a Shortcode block.
We do have plans to add user and taxonomy Views support to Blocks, though we'll probably get to taxonomy Views first as they are more popular than user Views.