Create frame border to match canvas dimensions

 
  1. Click-navigate to Frames menu by clicking left menu, then Elements submenu, then Frames submenu.
  2. Drag border rectangular frame from left menu.
  3. Double click on frame element to expand it to fit canvas.
  4. Click on Gear icon of frame element.
  5. Click on set button to restrain aspect ratio to match that of canvas.
  6. Resize frame element.
 

Hover over image to start animation