At certain browser window ratios the account selector drop down is partially hidden behind the "Red Hat Hybrid Cloud Console" menu, see screenshot.
I noticed this when opening the HCC on my laptop screen which has a resolution of 1920x1200 (16:10). On my main screen I see it too if I use a full screen window 3840x2160 (16:9).
For once opening a half screen window looks better as the account selector and the hamburger menu are displayed on the row below the main menu.