I installed GoLand (2019.3) via JetBrains Toolbox and I have an Ultimate account and I activated it.
I found that right click on a source code line didn't give me "Open on GitHub" button. I tried to search "Open on GitHub" action I found it is disabled (please see the two screenshots for demo). I don't know why? And I don't know how to enable it.
Can someone help? Also I am using GitHub Enterprise.
For the action to work you need two conditions:
Settings/Preferences | Version Control | GitHub
Then, this should work as expected.