The issue is that Anypoint Studio doesn’t support java 9, so as an alternative, you can start Anypoint Studio by using java 8 instead with this command assuming you are working on Mac.
/Applications/AnypointStudio.app/Contents/MacOS/AnypointStudio -vm /Library/java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin
Thanks, https://out-of-memo.blogspot.com/2017/10/mule-anypoint-studio-screen-frozen-at.html