Styles Extension for MIT App Inventor: A Deep Dive into UI Customization

Sometimes it does help, but blocks do not always have to be in English, this is not the other builder, this is Appinventor.

how can I change a single button with the styles extension I attach AIA.

Can you help me please?
A thousand thanks
Scodinzoland.aia (2.7 MB)

com.mrkoder.styles.dev.sryles.aix [mod edit do not post direct links to extensions by others]
This one, I can't change a single button, even looking at the creator's page.

can you give me a test app?
To understand the components you need.
I would be very grateful!
Thank you

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Hello, I'm new to Mit app, I'm learning
to use extensions. I am trying to use the Black_Knight Styles extension but I get the following error