1. Select two lines (don’t click on the blank space after selection, that is, don’t move the mouse randomly, complete the following steps) 2. Combine (combine the shortcut key ctrl L) 3. Press F10 (Styling Tool) Select any node on the two lines 4. Click the toolbar above to close the path. Ask me if you don’t know (I use CorelDRAW; Adobe Illustrator; Photoshop cs5; CNC carving and other plane and 3D drawings all year round. Professionally design trademark LOGO, Printed artwork, medal design)