You can buy adhesive stickers from Amazon that are designed to dim or black out LED lights entirely. For $5 you can get a pack with many different sizes. I use them in many places around the house.
Look for something like “LightDims Original Strength - Light Dimming LED Covers and Light Dimming Sheets for Routers, Electronics and Appliances and More. Dims 50-80% of Light, in Minimal Packaging.”