Summary: Line Label hotkeys are dedicated keyboard keys that you can use to select line labels while sketching your project. You can see each label's assigned key underlined in the Edge Action's Drawer of your project's Sketch Scene.
When using the Web App's sketch scene to draw your roof diagram, you can use keyboard shortcuts called "hotkeys" to draw lines with their line labels already applied. This can save you time and make the drawing process go faster.
List of Line Label hotkeys:
U: Unlabeled Line
E: Eave Line
R: Rake Line
I: Ridge Line
H: Hip Line
V: Valley Line
S: Step Line
W: Wall Line
P: Pitch Line
D: Delete Single Edge Line
Watch the video below to see the hotkeys in action:
Note: The line label hotkeys also work when selecting labels from the Edges tab of the Sketch Scene.