Hi, I am Dave, I will help you with this.
1
Right click your Desktop and select Display Settings.
Ensure that the Display Resolution and Scale are set to the items marked (recommended)
2
In that Settings app, select Accessibility - Color Filters and turn off any color filter that may be enabled
3
Select Accessibility - Contrast Themes and turn off any Contrast theme that may be enabled
4
Go to Personalization - Themes and ensure the default Windows Theme is set
5
If none of these has resolved the problem, please provide a photo of you screen so I can see the problem.