Rectangle (Filled) Tool 

Shortcut key: U
A tool for drawing rectangles by dragging.
The inside of the rectangle is filled.
Options
- Corner radius: The radius of the rounded corners
Related
- You can change the right-click action in Editor Settings. (Default: Eyedropper (pick color))
- Hold Shift while dragging to draw a square.
- Turn on Snap to Grid to draw rectangles aligned to the grid.