the establishment of conditionals to check field contents is common to the modules:
• News.
• Registries.
• Newsletters.
• Generics.
• Authentication.
• Products.

checking the field contents allows operations such as skipping (hiding) a block of information on the page or preview template if the proof proposed is false. a common example is hiding an image-type dynamic field < img src="..." ...> when the field is empty.

to define a checking criterion:

1.0.- in the document view, select the block of information to be shown if the condition to be checked is true:

2.0.- click on the object "Check field" at the end of the tab of the module you are working in:

2.1.- construct the check condition. Enter the parameters requested by "Check field" to do this: