ModeSelector:With Single Viewport Error

Build 1628 on dark-mode-adjustments
Dark
Reviewing disabled
Baseline History
Build 16289f0fd9b
Current build. There are unaccepted changes, so build 1559 is still the baseline.
Build 1559385705b current baseline
Accepted by Dominic Nguyen.
Build 931b1dae5b
Accepted by Tom Coleman.
Build 87901c1d31
Accepted by Gert Hengeveld.
Commenting is disabled because there's a newer build on this branch