No me aparece un bloque en app inventor

User Interface and Graphics
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As opções de blocos para as ferramentas não aparece na tela
Am missing some built-in features, like, contrals, vertical arrangement and others
user interface-connectivity
Some built-in blocks like control and various layouts are missing
Unable to find Activity Starter
Unable to find expert toolkit blocks
Blocks doesn't work propery (does not show all the tools)
No me salen las funciones de la screen
Screen blocks are gone!
ActivityStarter missing
Built in Text Block Options appear to be missing