Hello there, Gyzie1990.
It sounds like you are having issues navigating the App Store application on your new iPad Pro. The following Knowledge Base article, although written for applications you install on your iPad, provides some great initial recommendations for troubleshooting:
If an app you installed unexpectedly quits, stops responding, or won’t open - Apple Support
Close the app and open it again.
Turn your device off and back on.
Make sure that you're using latest version of iOS.
If you find the issue persists, proceeding with the recommendations here would be a good next step:
Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support
Thanks for reaching out to Apple Support Communities.
Cheers.