You might want to store some impact map-related information in the IM itself, like a map description, its scope, overall business or project goals related to this IM, etc. — anything that will give you and your teammates the necessary context.
UXPressia has got you covered. We have a special Description section where you can add all the important information about your impact map.
Use three blocks available by default or add more if you need. You can configure the background, font size, and colors for this section.
Note: If you want to export your map without metadata, be sure to collapse it before exporting.