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The field mapping is probably the best place in the UI but you are right that it is a one time snapshot taken at initial sync.
The field management section will tell you to which SFDC field a Markeot field is mapped but only on a one at a time basis so might not be ideal for this.
I'd recommend reaching out to support who should have access to a tool that shows your complete mapping per object with field types and field names etc. . They should be able to send you a copy of that.