You’ll get a red message on screen that warns you about the texture pool size as soon as you have a landscape actor in your scene. I usually ignore it. Maybe you can call it a bug. There was a thread I remember where people say that landscape always causes a warning about textures exceeding the limit. It may not mean that the game will have that problem.
Virtual textures are default now and they also seem to require a lot of texture memory. But that might also just be an editor issue.
Finally always try to use texture sizes based on a power of 2. Eg 1024 x 1024, 512 x 2048 and so on. This way unreal can build texture Lods (mipmaps) that can be used if the full size texture isn’t required.
Or reduce excessive texture sizes. Not everything needs to be 4k. You can reduce this in the editor per texture. I’m not on the computer so I can’t recall the exact setting. Something like ‘max texture size game’. Default is 0. Half size would be 1. Quarter size 2. Let me know if you need a better explanation.
The final judgement will be when you play your ‘game’. If it runs well then no need to fix it.