It can be difficult to adjust the picture on your Smart TV to your preference. Here are a few things you can do to adjust the brightness or darkness of the picture:

1. Check the ambient lighting in the room – The brightness of the room can drastically change the picture settings
2. Adjust the backlight – Depending on the features of your TV, there may be a setting to adjust the backlight. Make sure this is set to a comfortable level for viewing.
3. Reduce the brightness and contrast of the picture – If the backlight setting is not available, many Smart TVs allow you to change the brightness and contrast settings.