Here’s what my experience with this has been… when copying code from another Wappler project file… which contained server connect form, I encountered this tag.
This basically points to the Wappler project whose server action is being used in the action part.
Then, when I add more server connect forms, which have actions from current project, it still adds the site tag.
If you don’t have any server connect forms referencing other projects, just get rid of all the site properties, and from that point, adding new forms will not add the site property.
If you do have server connect forms, which have actions pointing to other projects, I think this site property allows Wappler to manage the picker UIs.