I'm having trouble with the development interface

I haven't used App Inventor in a long time. And now I'm having trouble with the interface. I created a new project and I'm missing important things - first of all, the extensions I added to the project after saving and refreshing the page are not visible, although in the project itself they are present until I remove them from the project. At the same time, if I add an extension again, I get a message that extension upgraded.
Secondly, when I switch to blocks, I don't see events and methods for screen and added extensions.
I haven't used it for about a year - what have I missed? How can I fix these problems?


In the project properties set toolkit to Default
Taifun

a sea of gratitude!!! I never would have thought that intermediate would have such an effect)))

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