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Edit > "Miroir horizontal" (M) and "Miroir vertical" (F), also in the folio's right-click menu, mirror the selected symbols in place. The keys are the ones the element editor uses for the same two actions. An element keeps two mirrors about its own axes, applied before its rotation, and saves them as mirror="horizontal|vertical|both" on its <element> (written only when set, so other projects save byte for byte as before). On a symbol turned by 90 or 270 degrees, a mirror of the folio is the other mirror of the symbol itself, so the rotation never changes: a label kept upright does not swing round, and "Pivoter" still turns a mirrored symbol clockwise. - Terminals face the mirrored way (Terminal::orientation()), so wires follow. - The symbol stays where it was: its centre is kept, on the grid, since the hotspot is often a corner. - Texts read normally. The element's texts, text groups and cross reference are mirrored a second time about the centre of their own box (Element::keepReadable()), and ElementPictureFactory draws the texts of the symbol itself the same way, in a cached picture per mirror. Groups and cross references held at the bottom of the folio stay centred under their element. - DXF export mirrors the symbol's lines, arcs and texts. - Scripting: qet.mirrorElement(folio, uuid, vertical) and qet.elementMirror(folio, uuid); live mode may run both menu commands; the MCP server gets a mirror_element op and qet_diff reports mirrors. Not done: the parts of a PLC table drawn at run time (Element::drawPlcTable()) are not kept readable on a mirrored PLC; the project database has no column for it, as it has none for the rotation. Test: tst_scriptmirror mirrors a symbol through --run, checks every terminal's side and facing, the round trip, undo, a save and reload, and a symbol turned by 90 degrees. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>