You can use page tools to make text larger or smaller on record pages. The Larger and Smaller page tools are not available for some record types.
To make the text larger:
Click the Larger icon in the page tools box in the upper right of the page.
To make the text smaller:
Click the Smaller icon in the page tools box.
Note that clicking either the Larger or Smaller icon will change the text size only; any images will remain the same size.