It use to be a preset box that meant all signatures could be scaled correctly. Now you have to free draw it making signatures look scruffy.
How can I make it revert to the preset box?
Sorry for the delay in response.
Would you mind letting us know Acrobat version you were using- Acrobat XI/ Acrobat X?
Have you tried changing following setting under signatures and check if that helps:
Go to Edit > Preferences > Signatures > Creation & appearance > More > uncheck the box use modern user interface for signing and Digital ID configuration > OK
Keep us posted with the results.
Nothing has changed. It still has to be drawn out not a box shape simply placed as before.