I am new here, start working with Thunkable recently, but I can’t find the way to create a simple rectangular shape, neither to fill it up according to the value assigned (that is what I am looking for at the end), can you help me? please
Are you trying to make something like this?

If so, you can use a button with no text or an image of your choice and change its width using blocks.
yes, something like that but vertical and rectangle, do you now where i can find some tutorial to achieve it?
No, I don’t know of a tutorial. You can search for one using terms like “power meter” or “health bar” or “loading status bar”.