To use Magnet tool inside modeler
Modify > Modeler > press (:)
First you need to go to the Modify menu and then choose the Modeler option. After that, you need to select the Magnet option or you could press (:) to select the magnet tool. You could use it to drag the point of the object or model inside your modeler. You could also use it to sculpt your model in specific shape. Magnet tool also can be sent in the brush size where you could adjust the amount of influence to the point at the object.
This is the brush size, which you could set it so that it is big enough to cover all the point area.
To adjust the brush size, you can click on the right mouse and drag it to the specific size that is suitable.