1, use shortcut key: In SU, you can use the shortcut key "Ctrl+Shift+Alt+C" to quickly close a line.
2. Use the toolbar: In Sue's toolbar, there is a "close" tool that can be used to quickly close lines.
3. Use the selection tool: use the selection tool to select both ends of the line, and then hold down the left mouse button and drag to quickly close the line.
4. Use layers: In SU, you can create layers to control the display and hiding of the model. You can use a layer to quickly close a line by selecting it, dragging it to the desired layer, and then using the close tool or shortcut key to close the line in that layer.