It is apparent you have not written many grant applications. :-)

For example, from the NIH (https://grants.nih.gov/grants/writing_application.htm):

Remember the Details! Below are tips to assist you in meeting the requirements on font, font size, margins and spacing. Be sure to follow the format in the instructions and label sections as requested.

Use an Arial, Helvetica, Palatino Linotype, or Georgia typeface, a black font color, and a font size of 11 points or larger. (A Symbol font may be used to insert Greek letters or special characters; the font size requirement still applies.)

Type density, including characters and spaces, must be no more than 15 characters per inch. Type may be no more than six lines per inch. Use standard paper size (8 ½" x 11) . Use at least one-half inch margins (top, bottom, left, and right) for all pages. No information should appear in the margins.