The Approval History section of the Approval Global Configuration screen allows hiding one/more Columns of the Approval Section.
In particular, the available customization options consist of:
By dafault the Approval History tab is displayed as follows:
The screenshots below show, on the right, the Approval History tab displayed on an issue based on the Approval History settings on the left.
Approval Global Configuration screen
JIRA issue screen- Approval History tab