I use Classic Quicken for Canada. I found that the Early Access / Customized Reports setting causes Quicken to ignore the report settings Display>Currency setting and shows amounts in Canadian dollars regardless of that setting, showing converted Canadian$ values for US$ accounts.
While working with dual currency investment accounts — ones with both a Canadian dollars side and a U.S. dollars side that I have to track separately — I found that with the "Early Access" enabled for "Customized Reports" that my U.S. dollars investments show on the report with Canadian dollar values even though I specifically changed the customize reports popup with Display > Currency > U.S. dollars. The Display>Currency setting appears to be ignored. This is for a custom report I created to help me figure out amounts for my U.S. tax filings (I file for both Canadian and U.S. taxes).
When I went to Preferences>Early Access and unchecked "Customized Reports" then the problem went away.
I use these tools to prepare FBAR reports that I have to file with the IRS. I need to present values for those reports in U.S. dollars, so determining investment account values means carefully converting the C$ half to U.S. dollars and adding that value to the US$ half to get the total account value. This is already a huge hassle with several accounts, as some of you know, and discovering this Quicken bug meant I had to re-do a LOT of work.
I will note that I did not opt-in to the "Early Access" setting — it was automatically set when I did a Quicken update. So if you (the reader) think you're escaping this problem by not opting-in then I suggest you check your own Preferences > Early Access settings. ;-)