InDesign offers a lot of flexibility when it comes to aligning objects. There are two ways in which you can align objects with respect to each other – one is by using alignment guides and the other is by using the Align panel.
When you click and drag objects to position them with respect to other objects, you will see green lines which serve as alignment guides. You can use these green lines to guide you on positioning the object either with respect to the center of the reference object/frame or with respect to the edges of the surrounding object/frame.
In the above example, it can be seen that the green box is being aligned with respect the text box above and the vertical green line is the alignment guide, which shows the center of the text box.
The Align panel makes it easy to align multiple objects at once. To access the Align panel, go to the Window menu, then go to the Object and Layout submenu and click Align to open the Align panel. Note, that the Align panel is contained in the same Pathfinder panel we’ve seen earlier.
The top row of the Align panel has options to align everything left, right, top, or bottom.
You can also use the Align panel to distribute objects within a given distance or align other objects with respect to a reference object or the key object. In the above example, it can be seen that all the selected objects could be aligned to the left with one click instead of relying on alignment guides.