Canvas doesn't fill parent

I have found this great app just today.

1. I have placed a canvas on the screen.

2. Disabled scrolling

3. Canvas width: fill parent -> This worked.

4. Canvas height: fill to parent -> When i clicked fit to parent, it is no filling parent. It covered probably only 20% of the screen.

Can you tell me if I am doing anything wrong here?

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You did not post a screen image of your blocks or a screen showing the unfilled Canvas.  Showing your 'blocks' lets us help you figure out what might be going wron or whether this is designed behavior.    Did you place a background image in the Canvas? 

Since you are new to App Inventor, you might find the following useful:

MITs tutorials    http://appinventor.mit.edu/explore/ai2/tutorials.html

AI2 free online eBook   http://appinventor.mit.edu/explore/ai2/tutorials.html   ... the links are at the bottom of the Web page.

They help teach you how to use App Inventor blocks.

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are you talking about the display in the designer?

try to enable Screen1  scrollable, then disable Screen1 scrollable again

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