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%.

Is there a setting in INDI to dim this please ?

EQMod driver has setting called LED Brightness if the mount has polarscope with LED. My current EQ8 doesn't but I think my previous HEQ5 did show it.

Odd. In my experience, what I set it to from the hand controller remained set.
But perhaps there is an option in EQMod driver that is overriding it.

Thanks for the tip Andrew.

I found it in the INDI Setup once EKOS was running.
Last entry on the mount options page.
Reduced from 255 to 20