By default, database viewers will have the background specified in Settings-Databases. If you wish, you can provide unique settings for each database file.
You can keep the system default white background, have an alternating line background or you can choose a custom background colour. The text colour will appropriately be set to black or white.
You can choose to draw a grid around the cells in the main table display. Dashed Grid draws dashed horizontal lines. Solid Grid draws solid horizontal lines. The grid presentation depends on the OS version.
You can also choose the light/dark appearance for each database file. If you are not running on OS 10.14 (Mojave) or later, the settings will be ignored. The values are:
The Defaults button will remove the unique settings and the database will once again display the background settings specified in Settings-Databases.