The Pointer Tool is for selecting, positioning and resizing shapes.
To select the Pointer Tool click its icon in the Toolkit panel, or choose menu option Edit > Select Tool > Pointer Tool (or keyboard shortcut ⌃A Control-A).
A shortcut way to select the Pointer Tool (when the Text Tool is selected) is to click anywhere on a blank page or canvas (i.e. off any shape).
Another way to select the Pointer Tool becomes available if you have one or more images selected with the Image Tool; a miniature Pointer Tool icon 
appears in the top right corner of each image control; simply click the icon to select the Pointer Tool. With the Pointer Tool selected, this icon is replaced by a Image Tool icon 
allowing you to quickly switch back and forth between the Pointer Tool and Image Tool.
With the Pointer Tool selected, click a shape to select it. If a shape is filled, select it by clicking anywhere it’s filled. If not, you need to click its outline path.
A selected shape is given resizing handles, as shown on the rightmost of the adjacent shapes.
Click anywhere off a selected shape to deselect it.
With the Pointer Tool selected, drag a selection zone to select all shapes lying fully within the zone.
Shift-click any shape to add/remove it from the current selection.
Click anywhere off the selected shapes to deselect them all.
With the Pointer Tool selected, when you hover the mouse over selected shape(s), notice that the mouse pointer changes to the 4-way arrow icon (shown right).
With the 4-way arrow icon showing, drag to move the current selection around the page/spread. Whilst dragging the mouse icon changes from the 4-way arrow to a hand.
NOTE: Snap to Grid is enabled by default, so unless you have turned it off, the current selection will jump from grid point to point as you move it around. This is helpful when aligning and distributing different shapes manually. The grid spacings can be altered using the Document Inspector. You can display/hide the grid and enable/disable the snap by using controls provided on the View menu and toolbar.
With the Pointer Tool selected, when you hover the mouse over the resizing handles of a selected shape, notice that the mouse pointer changes to an arrowhead icon (shown right).
With the arrowhead icon displayed, drag any resizing handle to resize a shape. Corner (blue) handles allow a 2-dimensional resize, whereas side (purple) handles allow a 1-dimensional stretch.
You can resize two or more shapes together, but only after you have grouped them by using the Group control provided on the Arrange menu and toolbar.
NOTE: The grid related comments about moving selected shapes (see above) also apply to resizing.