A ^XZ closes a format that was never opened (for example a doubled ^XZ). It is harmless on most printers but it usually means the pairing got out of step.
^XA^FO50,50^A0N,40^FDHELLO^FS^XZ^XZFinding: ZPL0004 · line 1:33 — ^XZ without a matching ^XA
Open the broken label in the editor →
Delete the orphan ^XZ, or add the ^XA it was supposed to close. The quick-fix removes the orphan command.
^XA^FO50,50^A0N,40^FDHELLO^FS^XZOpen the corrected label in the editor
ZPL0001 Missing ^XA · ZPL0002 Missing ^XZ · ZPL0003 Nested ^XA
npx labelixa validate "labels/**/*.zpl" lints your files and prints this page's address next to each finding. /docs/cli