Set X-Hairs sets the crosshairs either to align with the selected line or polyline or to a user-specified slope. Reset X-Hairs restores the crosshairs alignment to horizontal.
Pulldown Menu Location: Settings > Crosshairs
Keyboard Commands: setxhairs, resetxhairs
Prerequisite: Line entity
File Names: \lsp\xh.lsp, \lsp\rh.lsp