Scaling

Zooming in/out by holding down Ctrl and operating the mouse wheel

While holding down [Ctrl], turn the mouse wheel.

ope_zoom-with-mouse

Zooming in/out using the window toolbar

Click tb_view_zoom-in or tb_view_zoom-out.

ope_zoom-step-by-step

Click tb_view_zoom, and then drag the mouse pointer to enclose the location to magnify.

ope_zoom-area