Thanks. It's my policy/practice to open and close vertical spreads as a spread and not leg into or out of a spread position. I used to close out the short side of a profitable spread and leave the long side open "just in case" there was a black swan event which would make the long more valuable. Since beginning futures options trading that has happened exactly zero times. So I gave up the practice and either close out the spread as a spread or let the spread expire OTM. That said I should note that I don't purposely trade iron condors (i.e. all four legs a to once) but usually end up with a dynamic one because I'm trading both sides of the market using similar deltas. When I close one side or the other I may, or may not, reenter the market on the closed side.
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