How to Fix the Matrix Small City Map Bug in Unreal Engine 5 (RTX 2060 Super)

I was having a problem opening my Unreal Editor 5.3 version of the small_city map level from the Matrix City Sample demo for PC. Every time I tried to open the level, it would only show an ocean, without any buildings, streets or any other aspects of the map. This was weird because, if you hit play, the in-editor gameplay level would play without fail.
I made a video explaining how to fix this bug--it's actually very easy if you know what you're doing!
My specs as of this video are:
-MSI RTX 2060 Super graphics card (GPU) with 8 GB of VRAM
-Gigabyte Z790 UD AC Motherboard
-32 GB of RAM from Corsair
-Intel i7 13th Gen CPU

[@imaginingPhysics]

Thanks. And If the world partition tab is not visible, click on the yellow text No regions loaded.

[@Tech_Hobbyist1]

Thanks!