No, when you toggle them off the flashing green light indicates that they are off.

You could instead lower the TV Level to -15 which would silence them, with no flashing light.

Thanks, that’s what I’ve been doing, maybe they could have a mute option to toggle on/off.

It’s standard for a muted speaker to display a constant green light, so that wouldn’t work either, unless your issue is only with the flashing.

The green solid or flashing light seems unnecessary to me, should be able to customise it.

Actually, in general, you can turn off the speaker’s LED in Settings>(Room Name)> Status Light, although that doesn’t affect the “lit while muted” situation, for, I suspect, reasons of Customer Service. 

Amazon and others sell some very nice sticky dots in various colors and transparency levels that will deal with unwanted light.

First one I found: https://smile.amazon.com/LightDims-Original-Strength-Electronics-Appliances/dp/B00CLVEQCO/ref=sr_1_5