The Kivy designer is an abandoned project, the first few lines from the notes:
WARNING: This project is at an unstable alpha stage and is not yet suitable for general use. There is no current plan for continuing the development of Kivy Designer. The repository has been archived, please contact us if you intend to maintain the project.
Kivy adaptors are Deprecated since version 1.10.0: The feature has been deprecated.
I find a designer is not a useful tool when doing a gui design. At first it seems like it would be, but as you quickly learn, they always seem to get in the way.
Learn the KV language, it is a very powerful way to quickly design the UI.
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