There is a bug that caused the Investment Account Overview window to be missing some (but not all) of the column headers in the Canadian Classic version of Quicken. I do run Quicken on a 4K display with compatibility settings; I have not tested this on other displays to assess whether this issue is limited to the 4K display. Also note: there is a bug that prevents one from using the Report A Problem feature when running on a 4K display with compatibility settings, so please don't ask me to report the bug using that method.
Note: all personal data has been removed from the screenshot, which might make the view look unfamiliar, but it is the account overview for investment accounts, which should display the holdings.
[Edited - Readability]