Segmentation can only be adjusted on documents using a Translation Only workflow.
The segmentation feature is disabled on a document as soon as translations are saved–in any target language. This includes machine translations and translations from TM Leverage.
To adjust a document’s segmentation,
Open the untranslated document in the workbench.
In the context viewer, click to select the segment you want to change.
Then right click to display the Adjust Segment menu.