Does anyone know how to exclude Google Search Network and only show my ads on Display Network for app promotion on Adsense ?

I put 20 images but still %90 of the traffic on google play search.

I want this because, who comes from play store search has around %25 day 1 retention and who comes from display networks has %40 day 1 retention.

I could not find the option to turn it off or any options like how to play with network options.