In order to simplify getting help with Lineardraft, each window features a '?' button in top right corner which takes you to an article in the Helpcentre going over the window's function(s).
In the case of a single-function window (such as the 'Split Wire' window in the example below) the '?' button will take you to the how-to article explaining how to perform that function.
If it's a window with multiple functions (such as the 'Edit Structure' window) it will take you to an explainer article, covering each component of the window.