Extend
Use the Extend tool to extend the edge of one entity to meet the edges of another entity or join entities together.
To extend the entities:
Click on the Extend tool from the toolbar.
Click on the reference entity.
Hover over the entity that you want to extend. A preview of the extension will be shown.
Click to confirm.
Press Esc or click on the x in the top right corner of the sidebar to close the tool.