I am facing weird issue with xcode build setting for swift language version. I am trying to keep latest swift version i.e 5.3 but it is not showing in my xcode build setting. I upgraded xcode to 12.3 as well but no luck. Any suggestion?

I am facing weird issue with xcode build setting for swift language version. I am trying to keep latest swift version i.e 5.3 but it is not showing in my xcode build setting. I upgraded xcode to 12.3 as well but no luck. Any suggestion?

XCode 12 comes with swift 5.3, we are not able to choose between 5.1, 5.2 & 5.3. If you want to use Swift 5.2 then you have to use XCode 11.4 as mentioned here: https://developer.apple.com/support/xcode/
In order to determine which swift version you are using you can try this command in terminal:
xcrun swift -version
You will get something like that:
Apple Swift version 5.3.2 (swiftlang-1200.0.45 clang-1200.0.32.28)
Note: If you have installed different versions of XCode use :
xcrun --find swift in order to find the path of each swift and then use the above command to determine it's version.