How do I see all of a string in a textInput and add spaces?

I've explained this earlier:

If your string is 100 characters long, and you start from 3 to 100, by the time you reach 100th character, the string will be around 130 characters long, because you are adding spaces after every 3rd character. So the loop will stop at 100 and the remaining portion (30 last characters) of the string will not be processed.

If you run your loop in reverse, you avoid this issue.

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Another option would be using a While loop, it will run until the full string is processed, even if it grows or shrinks:

Local variable i=0
While i<len(s)
.....(process the string)
.....Add 1 to i

I was asking why the total of loops ran isn't the same in 'len(s) to 3' and '3 to len(s)'.

It is the same! In both cases with 100 characters in the string, the loop will run 98 times.

But if you start the loop from 3 to 100, at the end of the loop your loopindex will be at position 100, however the string will already be 130 characters long (because you've added ~30 spaces to it). So the remaining 30 characters at the end of the string will be left unprocessed.

I understand, that is what I needed.

If you start at 100 and loop to 3 then the space isn't counted when it is added.

If you start at 3 and loop to 100 then the spaces are counted and then the loop doesn't get to run enough times.

You were right, you did answer that already. I must have been missing something before because it passed right by me.