Modification of horizontal alignment

check handles are ON on the Select Element tools settings dialog

This doesn't seem to work for all alignments.

I have two alignments, both with the same feature definition, but only one of them shows me modification options

The handles sometimes disappear when changing feature definitions in plan.

Difficult to say what can be wrong here if handles are ON, no lock on the element and rules activated. What is the version?

And I am adding a more obvious reason: the 3D is displayed in the 2D and you select the 3D instead of the 2D.

You can turn off the 3D in the 2D and/or send the reference to the back (update sequence or F10) so that active model elements are selected first.

Difficult to say what can be wrong here if handles are ON, no lock on the element and rules activated. What is the version?

And I am adding a more obvious reason: the 3D is displayed in the 2D and you select the 3D instead of the 2D.

You can turn off the 3D in the 2D and/or send the reference to the back (update sequence or F10) so that active model elements are selected first.