src/components/fabric/QPolygon.js

@@ -251,7 +251,6 @@ export const QPolygon = fabric.util.createClass(fabric.Polygon, {
           obj.parentId === this.id &&
           obj.name !== POLYGON_TYPE.WALL &&
           obj.name !== POLYGON_TYPE.ROOF &&
-          obj.name !== 'lengthText' &&
           obj.name !== 'outerLine' &&
           obj.name !== 'baseLine',
         // && obj.name !== 'outerLinePoint',