This? (See attached)
That isn't for searching for a different prefix record like the Binocular or Funnel does (or clicking in the browse spreadsheet-looking window.) It changes the value of the DXCC Pfx field for the current record.
The button to the right searches thru all possible DXCC prefixes. Suppose you were entering a new prefix record for Canada. You click +. LOGic adds a blank record to the database. You could simply enter VE here. But suppose you forgot what the prefix for Canada is. So click on the three-dot button, enter Canada, Click Find, then the green checkmark.
It works exactly like the DXCC field on the log form. It changes the value of that field. It does not locate another log record with a DXCC matching the value you selected.
Is this helpful?
Tnx & 73,
Dennis WN4AZY