The top of the table view is black

For some reason, the top of my table view in the storyboard has turned black. This is where the navbar and dynamic cell are. This happened after I tried to customize the appearance of the table view by changing the values of two options - Style and Separator (the screenshot)

How do I get back the regular light color of the top of the table view?

Xcode 13.2, macOS Monterey 12.1

The top of the table view is black
 
 
Q