Click inside the canvas window (either in the background area or inside a
graphics window on the canvas). → The canvas window gets the focus,
indicated by its frame turning from gray to orange.
Press Ctrl+Shift++ to zoom in, or press Ctrl+Shift+- to zoom out.
Alternatively, hold Ctrl or Ctrl+Shift and scroll up to zoom in, or
scroll down to zoom out. You can change the zoom direction of the mouse
wheel via the general option Action
when spinning the mouse wheel down. Note that this setting also applies to
the graphics window. → The current zoom factor is displayed in the
bottom right corner of the canvas window. Click the zoom factor to reset
the view to 100%.