ios 11 and probably lower

I created an app and downloaded the app ios source to xcode and tried to install it to an older ios device running ios 11. It wasn't possible since the deployment target is 13. When I change this to 11 it brings a lot of compilation errors because many features are not compatible which ios 11.

Is it possible to generate the ios code for ios 11 or even probably lower before I download it?

Thanks in advance