The phrase "prevalent theme" means a common or widely recognized idea or subject that is repeated or frequently seen in a particular context or work. Full definition
Link is naturally attractive because of his courage and innocence — prevalent themes in many of the games. (riddlethos.com)
Find the most prevalent themes and subjects in your novels — ones that run through almost all your books. (howtoblogabook.com)
As seen in this selection of highlights from the collection, prevalent themes include portraiture and identity, landscape and the environment, politics and power. (21cmuseumhotels.com)