dv said:

Had ‘em deliver the new dishwasher and take away the old.
Dude said, “I see you’re using rinse aid. Seriously, don’t, it’s just a waste, your tabs already include a rinse agent.”

Boss lady: “I know but the light always comes on.”

Dude: “The light is just telling you the rinse aid compartment is empty. It’s not a warning light, just ignore it.”

Boss lady: “Right but how do I make it be off?”

Dude: “Well, you don’t. It just stays on.”

Check the instruction/owners manual. There may be a setting to disable the indicator.