I don't believe there is a way to delete screens. However, you can't uninstall pre-installed apps unless you are rooted. This is because those are installed as System Apps. If you root your tablet, then you can uninstall them.
Be advised, removing certain system apps can cause crashes and instability in the system.
The only way to modify how many screens you have is to use a custom ROM, or a 3rd party home top application.
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