Administration > Environment Variables > APTBGDEPTHPCT — Specifying the Depth below the Baseline for Font Background
  
APTBGDEPTHPCT — Specifying the Depth below the Baseline for Font Background
Specify the percentage used to calculate the background shading rectangle behind a font when it's being highlighted. Specify an integer, which is a percentage relative to the font size, to set the depth below the baseline for the font background shading.
APTBGDEPTHPCT affects output for PostScript and Print Preview on all platforms.
You can set a value greater than 100. The default is 30%.