Yes tons of research

There were multiple waves out of Africa but Most early anatomical human groups never left Africa as a result, there’s more DNA diversity within the continent than outside Africa

Its confusing because the non-african group grew exponentially while the intra-African continent continued to mature

The anatomically modern humans that left Africa spread rapidly and aggressively across the world basically absorbing and destroying every proto-human group and ecological niche and

now the world is ruled by the aggressive narcissistic chimeral hybrid of human (African) Neanderthal (European proto human) and denisovian (Peking man) that survived the exit snd expansion

https://pmc.ncbi.nlm.nih.gov/articles/PMC4067985/