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> how evolution can happen without natural selection

This sounds incoherent. What does "natural selection" mean to you?

Modern usage of “evolution” sometimes conflates “change of the organism over time or a lineage between generations” with “Darwinian selection”. Sexual selection is an easy example of evolution that’s not due to Darwinian “natural” selection.

Sexual selection was one of Darwin's key insights. He realized that the 'fittest' in 'survival of the fittest' was not just about living longer.

https://www.darwinproject.ac.uk/commentary/evolution/sexual-...

Sexual selection is literally a textbook example of natural selection.

"Change of the organism between generations" is called "genetic drift" if it's undirected and "selection" if it's directed. The concept of "evolution without natural selection" doesn't really exist.

Selection is how you get organisms that appear to be designed for a purpose. Sexual attractiveness is a purpose.

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