Quick response to get you some ideas...
You can filter so that tracks that do/don't match some criteria are not shown.
Customize the view, and click
Set rules for file display.... In your case, select the Filename (path) field, and enter either the full path or portion thereof, and select the appropriate pulldown (eg. contains, does not contain, etc.). So if you wanted to skip files that contain the folder name "Non-album Tracks", select "does not contain" and enter that folder name. OK your way out of the dialog and now those tracks will not be displayed in this view.
The Album groupings you see, are driven by the track's properties (eg. Album, Artist, Genre, etc.). Views are configured to utilize these, and organize the tracks according to the view's rules. So you can change the rules in a stock view, or just create a new view to suit your needs. You might for example, create a view which uses an expression indicating that all Non-album Tracks are grouped (those, for example, w/out track numbers), otherwise group by Album.
Within your Non-album Track folder, if any of the tracks has artwork, and you group them as mentioned above, the grouping thumbnails will be appear as a stack of the track's artwork (which cycles).
Here's is an example of a view grouping Non-album Tracks into one group, and all other albums by Album name. Note how the Non-album Tracks group is a stack of thumbnails.