Macbook Pro 2018 Operates Very Hot

As you have seen with Chrome, some apps can affect heat production. So can anti-virus software, so-called "cleaning" apps, and torrent software. This Apple article discusses the software effect on heat:

See how apps affect Mac performance, battery runtime, temperature, and fan activity - Apple Support

To see if something about how you use the computer affects heat dissipation, look at vent locations. Air intake is usually through the keyboard or vents low on the case's sides. All MBPs exhaust hot air through the hinge area. If either type is blocked, internal heat will rise. Here is where they are on a 15-inch Retina MBP (actual photo is from an earlier model but the location is basically the same for the 2018):

Your computer will shut down before it "too hot".

Keep your Mac notebook within acceptable operating temperatures - Apple Support