In Appian Designer, the size of large document folders and Knowledge Centers (larger than around 2 gigabytes) is incorrect and may appear as a negative number:
This issue has been addressed via AN-50653 in the following hotfixes/versions:
Apply the latest hotfix to your Appian installation or upgrade to the latest version of Appian.
This article applies to Appian 19.3 and earlier.
Last Reviewed: September 2019