Select Undo
from the right-click menu, OR
Type u followed by Enter in the prompt line.
Examine2D > Boundaries > Add Boundaries
If at any time you make a mistake while entering boundaries, you may "undo" the vertices of the boundary you are entering, with the vertex Undo option, as follows:
Select Undo
from the right-click menu, OR
Type u followed by Enter in the prompt line.
Either action will remove the last vertex from the current polyline you are entering. Undo can be repeated any number of times to remove successive vertices from a boundary you are drawing – experiment with this option to see how it works.
Tips
If you have made a mistake entering an arc , the vertex Undo command will remove the entire arc (i.e. all vertices on the arc segment).
The vertex Undo command is only operative while you are entering a boundary. After a boundary has been added, you can use the global Undo option (in the toolbar or Edit menu), to remove the entire boundary, if necessary. Or use the boundary editing options to edit the boundary.