9.0 cake: are there any shortcuts that can adjust the brightness unintentionally in a Huawei Nova 3i (Android 9)

I am trying to help an older person with vision problems with their phone. She discovered that when automatic brightness settings are enabled, the screen is too dark for her to see.

Without automatic brightness enabled, you are somehow managing to reduce brightness by mistake. I wonder if there is a shortcut that is somehow being activated and that reduces brightness.