From the list that appears, select the color you want.
Choose a color from the list that appears
Below is the selection of Light Gray Gray.
Light Gray light gray background
You can also select Select Custom Color to select the detailed color in the color box that Photoshop supports.
Choose a more detailed color in the Custom dialog box
Select Edit > Preferences > Interface on Windows machine. Or Photoshop > Preferences > Interface on Mac.
Select colors in the Preferences dialog box
Under the options in the Standard Screen Mode Color section, select the color you want or Custom to select a more detailed color then click OK to apply the change. In addition, you can also change the background and different views like Full Screen, Full Screen with Menus and Artboards in this same dialog.