To use Bend tool inside modeler
Modify > Modeler > Bend or press (~)
If you would like to use the bend tool, first you need to go to the Modeler option from the Modify menu. After that, you need to choose the Bend option or press (~) to select Bend tool. You could use it to bend the point or polygon as part of sculpting process in your projects.
Normally the Bend tools could bend the object in x, y, z-axis but it is advisable to use it under the top perspective as you can see how Bend tool bends the objects.