Polylines are different from wires. Polylines have no electrical properties, while wires have electrical properties. Although the two are the same, the actual usage is different. Polylines cannot be placed in place of wires.
In a schematic, you can draw lines in any direction. Modify line style, color, fill color, etc.
Top shortcut bar - Polyline.
Top shortcut bar - Place - Polyline.
Shortcut key AIT+L.