It seems yet another new version of Rigexpert Antscope has been released, and it maintains the scale limits available for R,X plots to +/-2000Ω, it still does not allow the range permitted by v4.2.57 (+/-5000Ω).
No change details provided by Rigexpert.
Back to v4.2.57, though it is very likely it has undisclosed defects fixed in later releases.
Bottom line is that if you want an analyser with direct graphing of impedances over 2000Ω (eg measuring common mode choke impedance), think of a different analyser.