Xojo 2025r3: What is this Window?

In the Navigator, I choosed the macOS entry and found this, click in it and get this window. What is it for ?

Its close button (top left, not red) does not works. To close it I had to click in Cancel.

Xojo 2025r3 / MacTahoe 26.1

That is the property list editor for metadata included in the app.

Seems like it runs as dialog and the close button is disabled.

See also documentation:

Thank you Christian.

So this is the plist editor some were reffered to in the Forum.

That is why I do not found it while I was looking at the Xojo Menus / Items…