The Form Designer provides dynamic functionality that you’ll find in the properties area when clicking on a Form field.
Typically, you’ll be able to configure 

Basic Properties

Title Text

The title text is shown to the user.

Dynamic Filtering of Choices (Cascading List Questions)

For cases where the answer of a prior List question determines the available answers for a Choices question.

Validation & Behaviour

Conditional Logic (Visibility)

Control the visibility of this field using a formula.

Dynamic Value

Define a calculation/formula that will populate this field’s value

Used if the answer for this question should be populated based on the answer to previous question(s).

Dynamic Question Text and Hints

The ability to include answers from prior questions in the displayed label and/or hint of a question.

Custom Validation

Add your own custom formula to validate answers in this field. The formula is only applied when the field has an answer.

Validation Message

Custom message to display if the answer is invalid.

Advanced Options

Default Value

A static default answer value that the question should have prior to the App User editing it.

Apply Watermark to Images

Using a formula-based input, names, GPS, time, date, and any other values can be superimposed onto variable locations on a Media, Signature, or Sketch Field image value.

The Watermark size is directly and inversely proportional to the Image pixel limit size, set to 800 by default on the Title bar, so that the smaller the limit, the larger the Watermark.