Error en la pantalla para desarrollar

Aparece en el costado derecho una barra verde que no deja ver correctamente la pantalla.

A green bar appears on the right side that does not reveal the screen correctly.
(Google Translate by Taifun)

Hello Mario

That’s not much information for us to think about - do you mean App Inventor in the Browser? Your App on a Smart Phone?

Can you make a screenshot showing the problem?