How to: Set slide and page margins in PowerPoint.
Solution:
To set margins, resize the objects on the screen.
NOTE: Margins in PowerPoint are not fixed but are dependent on the position of the objects on the screen.
1) Select an object.
2) Click on one of the object's eight resizing handles. (The cursor changes to a double-headed arrow.)
NOTE: There are eight resizing handles around the border, one for each possible direction. Click on the resizing handle for the direction in which the object size is to be changed.
Resizing handle
3) Drag the object to increase or decrease the size, and to achieve the desired margin space.
4) (Optional) Repeat steps 2) and 3) to change the object size in other directions.
5) Move the object to the desired location, to achieve the desired margin space.