I'm referring to the 2-4 weeks in between filing the application and giving fingerprints. You shouldn't have a problem leaving the US for that short time frame, unless you got a warning not to travel again without a reentry permit.
This is a very critical for me. I need to leave after filing and come back for the FP. My lawyer told me I should stay in the US during that time. Did you or somebody you know get a RP approved, having spend time outside the US between filing and fingerprinting? Thank you so much!