We often get calls on a technical support issue with regard to sketch constraints.
The problem is now and again sketch constraints go missing i.e when drawing a line the endpoint of that line will not constrain to another.
To resolve this you will need to activate the following:
In Sketch Mode navigate to the Constrain Panel and ensure that Constraint Inference, Constraint Persistence & Persistent Dimension are all activated.
Once that is complete, in the same activated sketch, right click and select constraint options.
Finally, ensure that the following options are activated.
This will activate all constraints and dynamically activate constraints as you sketch
Hope this helps
If you’ve and further questions, please feel free to contact us.