When I set up each time, I do a rough PA using the built-in reticule on the HEQ5 Pro.
When it's connected to EKOS it seems the LED that lights up the reticule is on full.
Instead I connected the handset to the mount and dialled down the brightness to 2% and it does indeed dim it.
When I restart everything and connect again via INDI it's back at 100%.