Leela likes to play long sequences of ataris. Against weaker players this often works, but stronger players can easily beat the engine by playing solidly.
Like GNU Go, its impression about the status of groups isn't always correct, and sometimes it just misses to save a large group from being killed.
If you're a single-digit kyu player, you may try taking all four corners and then destroying Leela's center moyo. Just take care that the moyo border doesn't become water-proof. This works well for me.