Hi. I have this problem as well. I would like an option to explicitly show non-printable characters like  
in editor mode.
Here is another example of a document where there are a lot of hidden non-breaking spaces disrupting the flow of text, but it was not obvious why. This is just a regular well-formatted bullet list except a lot of the spaces are actually non-breaking spaces leftover from copy-pasting from a web page.
A tip for anyone else struggling with this. I was able to create a custom regex rule for the Linter plugin to convert  
to spaces like this.
- Find:
\xA0
(doesn’t work with the full\xC2\xA0
but somehow it doesn’t need it) - Flag:
gm
- Replace: (insert space here, or escaped space if desired)