Hey @tamainut,
Thank you for doing 1 and 2.
For #3, it’s because you’re using the old version. You can see the latest version in our Version Compatibility list at https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195. To update to the latest version, you will need to uninstall the old one and go to X > Validation and install the Google Analytics.
Even with that old version though, I see that it works. I see the GA code exactly as in your screenshot.
As I’ve said previously, the code will not be present when you’re logged in so in order to test the code, you need to log out of WordPress Admin.
Thanks.