I can't just edit story point estimation by not starting the sprint.
Here by the hover I can edit the estimation:

But to add story point estimation for the tasks with no active sprint is not possible at all:

Here I've added the field:

But the field still does not display here:

It would be great to get your recommendation.
The type of the project - Company-managed software.
The field naming is the same - "Story Points".
What am I doing wrong?
I need these estimation for my test Epic Burndown.

But I just can't add the estimation for not active sprints tasks.