Check the main Federal worksheet and/or the main State Worksheet and see if that form is available to be e-filed... Idaho is not a big state and I doubt if there are a large number of tax preparers there who use Pro Series so this form may or may not be available... just my opinion...

Look for a "Amended" box to check on the Form 43

I don't believe a 43X exists

Idaho uses the same Form 40 for original and amended returns.  In the upper right corner of the Form 40 is a check box if it is an amended return.  On the next line you choose the reason for the amendment from a drop down list.   Lines 58 through 61 on page 2 will calculate the amended refund or balance due.  It will be a mail-in return.

Amending a Form 43 is handled the same way.

@suesayers 👍 good job Sue...