Lines - curved or sharp corners

Here is a short demo of how to set connecting lines to have curved or sharp corners.

Curve lines 

1. Hover over the line until it turns blue
2. Click and hold for one second
3. Start moving the mouse
4. You will see the line curve.

To  remove the curve:

1. Hover over the line
2. The line will turn blue and you'll see blue dots
3. Click on the blue dot to remove the curve