In you PP look for the lines 414 and 415, these can be altered to what you want depending on whether you are using Inches or Metric.
414. Number of decimal places for metric numbers ? 3
415. Number of decimal places for English numbers? 4
You may also need to go to your "Preferences" tab and try resetting the "Units" to 3 decimals instead of 4 which the software defaults to when using Inches, see images attached.
Hope that helps
Regards
Rob