It can be found in:
Launch | Job Planning in the Staff Control Panel.
This screen is available from 20.3.1 version onwards.
This feature has been made accessible to allow the current COVID-19 extension that has been provided by Companies House.
This screen allows the selected jobs to add extension(s) to the statutory deadline field by months or by days.
Once these options have been selected, clicking OK will confirm the selections made to the selected clients on the Job Planning screen.
More information on Companies House COVID-19 can be found here.