how to edit the converted lead records?

how to edit the converted lead records?

so I can fetch the converted leads records using API (COQL), using this endpoint


and using COQL filter Converted__s=true

for some reasons I need to change the value from a field in a converted lead record.
When I try to find and click the converted lead record, I can't no longer access the lead record like this


I need to change the value from a field from the converted lead, so when I fetch using COQL API, the record will also be updated