Its just not implemented yet as the new issue view is a work in progress. So just switch back to the old view mode.
This is just a common way of releasing new functions which is not specific to Atlassian.
A software manufacturer generally knows what specific function is commonly used. So when designing the new interface they start with what is used mostly and give the possibility to switch back to old interface until the time when people are generally happy with both form and function.
If they were to do everything at once, and then everyone hated it, then that would be a major investment down the drain and cause major issues.
I am sure it will be added to the new issue view eventually or someone will solve it through plugins.
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