[NAME]  The system should ignore the display as a power source if you have a higher wattage power source connected simultaneously. The display doesn't persistently deliver power.  The way USB PD works is that a negotiation occurs between the power source and the device being charged.  The power source advertises the power levels it supports, and then the device on the other end (the laptop in your case) is allowed to choose from any of those power levels.  If your laptop already has a 130W power source connected, then it would have no reason to request any power from the display, and therefore the display won't provide any.  You won't damage anything at all, in fact in the early days of Dell's USB-C and TB3 docking stations, Dell specifically recommended keeping the system's power adapter and the dock connected simultaneously for people who had their Precision 7000 Series systems.  The reason is that the docks could only provide up to 130W, while the systems were designed for 180W or more.  Since then Dell has offered some docks capable of providing up to 210W of power by connecting to two USB-C/TB3 connectors on the system side, but that wasn't available earlier.
I have an XPS 9700 connected to a U2720Q monitor with a TB3 cable. However, I keep the laptop plugged in throughout the day as well. Power Manager is set to not overcharge, and even with the TB3 connection it still reports as not charging, so that is good. I'm curious about what happens to the additional 90 W coming in from monitor? Is it adding more heat and/or load? I'm concerned of potential wear from the extra power over the long term. Thank you and good day.
Multiple power sources (Thunderbolt 3 + Power Brick)