Mouse menu:
Contextual->Point in line
With this option selected, when creating a new point or line, etc., you can only select points that lie on existing lines.
To switch it off, simply select 'No Point in line'.
Mouse menu:
Contextual->Point in line
With this option selected, when creating a new point or line, etc., you can only select points that lie on existing lines.
To switch it off, simply select 'No Point in line'.