This is how it works:
Go to Field definition (objects) in the settings menu
Click Create Field
Select a field type and enter the appropriate values. We create the field "guarantee date".
We will show you here how the creation of fields works in detail.
Confirm with OK
Click on the column icon in the objects menu and move the new field to the desired position via drag & drop
the "Guarantee Date" field is now displayed as a column in the objects list.