In PowerPoint align objects so they look more appealing and use the PowerPoint order of objects feature to rearrange them how you want.
You may want to group multiple objects into one object so they will stay together if they are moved or resized. This is often easier than selecting all of the objects each time you want to move them.
Pictures, shapes, clip art, and text boxes can all be grouped together; however, placeholders cannot be grouped. If you will be grouping pictures, use one of the commands in the Images group on the Insert tab to insert pictures instead of the picture icon inside the placeholder.
If you want to edit or move one of the objects in the group, double-click to select the object. You can then edit it or move it to the desired location.
If you select the objects and the Group command is disabled, it may be because one of the objects is inside a placeholder. If this happens, try reinserting the images by using the Pictures command on the Insert tab.