To use Size tool inside modeler
Modify > Modeler > Shift (h)
First you need to go to Modify menu and then select the Modeler option. Later, you need to select the Size option or just press the Shift (h) to select the Size tool. It's used to scale the point or polygon as part of the sculpting process in your projects. Size is used in sizing the object or selection in a proper format or with the same rate.