You are trying to find the functionality to copy a section if the screen, however you are not finding it in the Adapt Mode on Fiori
SAP Cloud for Customer
The copy of a section is not available for Fiori Adapt Mode.
This is planned for future releases, however at this moment it is not available.
Fiori adapt mode, adaptation, UI copy section , KBA , AP-RC-UIF-FLX-FRW , UI Adaptation Framework , Product Enhancement