The E-PL3 does not offer focus peaking, so your main in-camera aid is still the magnified focus assist/1:1 view. That’s the most accurate option on this body.

To work faster, use manual-focus techniques instead of checking magnification every shot:

• Stop the lens down to increase depth of field.
• Use the lens’s distance and depth-of-field scales to zone focus or set a hyperfocal distance.
• Estimate or measure subject distance and preset focus using the lens scale.
• For street or general shooting, many photographers stop down (for example around f/8) and rely on scale focusing.
• If the subject distance doesn’t change, you usually only need to magnify and confirm focus once.
• A tripod or monopod can also help with precision.

So, on the E-PL3 there isn’t really a hidden setting that replaces magnified view. The practical improvement is to combine the magnifier with scale focusing, zone focusing, and smaller apertures. If you want peaking specifically, that requires a different camera body that supports it.