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To remove the arrow at the bottom of the screen? It sits directly under the spacebar so constantly gets pressed by accident, should be at the top of the screen.
I totally agree, it drives me round the bend!!
Edit the quick launch to have only the items you really use
E-mail, Messaging and S-planner sits in my q-launch.
This is good, but I think the OP wanted to remove the button altogether. There is no way to do this without rooting and deleting certain system files.