You can export a DMN decision table as a graphic.
Procedure
Open the relevant DMN decision table.
Activate the Contents tab bar.
Select Export > As a graphic.
Select the file location and the file type and enter a name for the file.
Select the location, the name, and the file type (JPG, PNG, or EMF) under which you want to save the DMN diagram file.
Click OK.
The DMN decision table is exported as a graphic.