Tools > Path > Curve Before
Curve Before
The Curve Before command allows you to turn the line segment before the selected node into a bezier curve. The selected node is marked by the red square.
1. Do one of the following:
 Choose Tools > Path > Curve Before
 Press Ctrl+1
Click the Curve Before button
Related Information
Tools > Path > Line Before
Tools > Path > Curve After
Adjust > Curves
Selection > Transform into Curve
Search the Internet