I must say the meaning "to manage affairs" does not exist in French, hence this may be more appropriate in the English language section.
Nevertheless, I can help you guess the evolution of meaning :
solicitor, "one who urges" from Old French soliciteor. soliciteur, from soliciter. Meaning "one who conducts matters on behalft of another" is from early 15c.
As I understand, a wealthy person hires a solicitor, to ‘solicit’ (urge) their clients/suppliers/employees to get them do what he expects.
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