The 9th order address is not integrated in the order masks by default.
It can be added exclusively via the mask generator.

Adding 9th address to a mask set

The example is based on a sea freight order mask.

For example, call the header data of the See Export mask set.

Put the mask into the edit mode.

Then use the Add Fields button in the toolbox.

The window for selecting the fields will open.

Add fields button in toolbox

Switch to the Addresses or All Fields screen.

Here the 9th address is available for selection.

Drag the address block into the mask and then place them as desired.

Save the mask set and create a corresponding entry in the mask set control.