As you can see in the gif below, I click through the company jira (left side) with the same interactions as I click through my personal jira (free plan - right side).
The result is different. The free plan on the right ends with a calendar view, the company jira on the left side without a calendar view.
I could not find any hint, in what scenario the feature would be disabled and where to enable it. Therefore any hint on what might cause this is highly appreciated.