What can I do to help prevent my laptop from overheating while using Unreal Engine 5?

The easiest immediate solution is just UNPLUG the power cable and let the laptop run off BATTERY power for now. So that the laptop falls back on the built-in OS / Bios settings which should lower overall laptop performance across all hardware / devices. After that, see similar threads like the one below, that cover capping-frame-rate / turning off real-time in all editors:

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