Assign the numbering method for newly created elements.
From the Main Menu select Node/Element > Elements > Start Element Number.
Smallest Unused Number
Select the option when the smallest number among the unused element numbers is to be assigned
Largest Used Number + 1
Select the option when the largest element number currently in use +1 is to be assigned
User-Defined Number
Select the option when user-defined number is to be assigned
If an existing element number is entered, the smallest unused number larger than the entered number is automatically assigned.