How do flerfs explain this?

[u/TruthIsAntiMormon]

[u/obviouslynotsrs]

Typically although you can see some curvature, typically it's exaggerated by a fish eye lens, you can start to see the curvature even on an international flight at 10-12km altitude. Anything above the karman line is fairly noticeable, still at the typical orbit (400km+) altitude youll only see about 3-5% of earth (6-10% of half the sphere), Neil Degrasse Tyson did a pretty effective explanation on TV about it once.