Quote Request Statuses setting allows selecting the default request statuses.
This option is located in the Admin Panel > General Settings > 'Sales Module' tab.
All the statuses are available in the dropdown and once selected, they appear in the list below the dropdown.
Upon saving, the statuses will update in the request edit section (as per screen on the right).
To remove the status from the list simply click on the status icon - - and save the updated settings.