If you wish to clear the splash screen or change it with a new picture, you can do it by following these steps.
From the Design Environment, go to Tools and select the Menu Bar Editor.
Once the Menu Bar Editor appears, select Menu and go to Show Custom Menus.
From here you will be able to change the picture on the splash screen by pasting an image from the clipboard, or clear the splash screen to the default splash screen which is the 4D logo.
Select Edit, and select Clear. This will delete the current custom splash and default the splash screen to the 4D logo.