I’ve been using controller + mouse for years since OW1 days and rarely ever have to make any adjustments to settings.
Today with S17 started, when using a controller + mouse at the same time, the HUD elements swap back and forth between controller icons and mouse/keyboard icons rapid when moving with controller stick for movement and mouse for aiming.
This is despite having the option “FORCE KEYBOARD/MOUSEUSER INTERFACE” turned “ON”.
Have made no adjustments to Hero & HUD or other Controls options from S16 to S17.