Select the object you want to resize in the Scene View.
Click Item Tools tab Transform panel Scale .
Use the scale gizmo to resize the currently selected object:
To resize the objects across a single axis only, use colored arrows at the end of the axes. To resize the objects across two axes at the same time, use colored triangles in the middle of the axes. Finally, to resize the objects across all three axes at the same time, use the ball in the center of the gizmo.
You can modify the center of scaling. To do this, place the mouse over the ball in the middle of the gizmo, and hold down the CTRL key while dragging the ball on the screen.