He played his best as a left winger for West Brom. Hopefully this was just him finding his feet and the jump from Championship to Premier League isn't too far in the future.
Every time I saw WBA on the box, he started on the left of the front 3 but was allowed to roam all over the place (apart from defending).
His last 10 games were on the left - got most of his assists and scored most of his goals from there https://www.transfermarkt.co.uk/harvey-barnes/leistungsdaten/spieler/398065