@Bill132: Please take a look at the following to see if this helps.
- Settings > Digital Wellbeing and Parental Controls > Bedtime Mode > Toggle off 'Turn On As Scheduled'
- Settings > Accessibility > Visibility Enhancements > Colour Correction > Use Colour Correction > Off
- Settings > Display > Select 'Light' instead of 'Dark'
- Settings > Battery and Device Care > Battery > Power Saving Mode > Off.