Question

How can I disable the grey background / highlighting of Scroll Ignore macros?

Answer

To disable the highlighting, simply navigate to Confluence administration > Scroll Runtime > Advanced Plugin Settings, and select Scroll Exporter Extensions from the dropdown.
Then change the value of the setting enableScrollIgnoreContentHighlight to false.

(warning) On Cloud it's currently not possible to disable it. We have the following open feature request for introducing this functionality: https://k15t.jira.com/browse/EXP-3295