Time tracking is a field that comes out as several fields in the appropriate places. Original estimate is part of it, but in theory, you don't need to see it a lot of the time - you can infer it from the remaining estimate and worklogs.
In order to add Original estimate field along with remaining estimate, you will need to go in Administration -> System -> Time Tracking and deactivate -> switch off legacy mode, and then reactivate,
Here is the link to it
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