I replaced a kitchen sink and the p-trap. I had to make some minor adjustments to the configuration as the new sink drain was too close to the outlet pipe for the old p-trap to fit. Now when I turn on the disposer, it backs up into the opposite side of the sink. Any ideas?

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the new sink drain was too close to the outlet pipe for the old p-trap to fit

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Let's hear more about that. If the old trap wouldn't hook up what did you install in place of it?

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when I turn on the disposer, it backs up into the opposite side of the sink.

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You forgot to mention the sink was full of water and wouldn't drain. When both tubs have water turning on the disposal will act like a centrifugal pump and pump from the disposable to the other tub. Does your sink drain or do you have a blockage? Give us more information. Back to you, Tom