How to remove the message "Object opened contains legacy Graphic Property .."

From R2021xFD06 & R2022x, you can have this warning message when you open any products created before these levels.

The better is to execute a batch available in the software (under Tools / Utility...) that will migrate all yours data at the same time. The following PPT is providing the methodology and also the link from the official documentation (path must be upgraded with your local installation)