When using the Pencil tool, note that you will have to adjust the stroke width to highlight content:
The Opacity Dropdown can be used to determine the level or transparency in the highlight. Select Multiply from the Blend Mode dropdown menu to allow background objects to show through the highlight.Click the Format tab, then click the Fill Color dropdown menu to select a color for the highlight.Click and drag the pointer to determine the dimensions of the highlight:.The Rectangle and Pencil Tool can both be used for this purpose.
How do I freehand highlight a document? Answer:
How do I highlight content in documents that contain only images?
