@Pavel and @Markus, thanks for your replies.
Re the formatting, yes, we realized what's happening, and not a big issue. I tried to delete the post but apparently there's no provision for that except marking it as "answered".
Since we had another question about the validation, and it appears that Pavel touched on it here, here's what we do: just follow the instructions in one of your videos, by selecting to check for empty fields ("make required") and adding the specific validation for text fields to allow only "alphanumeric" characters in the Advanced>ValidatorDefinition>ExpectedFormat>AlphaNumeric.
Testing this setup by entering text in the field, resulted in error "non alphanumeric characters not allowed", which is contrary to the actual intended validation.
Haven't yet a chance to check the video, but this is more related to the "out-of-the-box" functionality which is apparently not correct.