Lock Point Entry Fields

Lock an individual field in a collection of fields that accepts multiple components from a single point entry (for example, the U coordinate, V coordinate and N coordinate for a point).

A field which accepts multiple values from point entry has a button next to it. If the button is clicked, the button indicates that the field maintains its current value and will not be updated during point entry.

Figure 1. The button indicates that the point entry field is unlocked.
As an example, use point entry to enter the coordinates of a point in the 3D view as the base corner of a cuboid. Lock the X coordinate and Y coordinate and use point entry again to enter a different Z coordinate.