Ubuntu Installation :: Skip Grub OS Selection Screen

Im using the following system setup: When I boot my business computer, I can choose between 3 setups, 2 Windows XP, 1 DOS. I installed Ubuntu with 1 Windows XP system which looks something like this:

System 1 (XP)
System 2 (XP) --> after selection, Im able to choose between the XP system and Ubuntu on a new screen
System 3 (DOS)

Now interesting for me is obviously System 2. After I select System 2, I can choose between XP and Ubuntu. After I select Ubuntu, I come to another screen, where I can choose again between 4 Ubuntu entries with different kernel versions (including their recovery modes) AND both XP systems (yes, again). I installed Grub Customizer. I removed all the XP entries and all but 1 Ubuntu entry from this screen. I also set the timeout until booting Ubuntu on this screen to 1 second to start as quick as possible and Ubuntu boots fine.

My question now is, is there a way to skip the screen with former kernel and XP selection and boot Ubuntu directly after already choosing (between XP and Ubuntu) on the first screen? I know, 1 second "waiting" is not too bad but skipping the screen completly would be superb.