I'm new to Gravity Forms.
At https://docs.gravityforms.com/gform_field_standard_settings/ one finds an example to create a new standard setting for "Single Line Text" fields on the field’s General tab. I tried to change it and it worked well.
But: I tried to create such a custom setting for an other of the provided fields, such as "Paragraph Text" or "Number" or so, but failed.
And: I wondered, there is no indication whatsoever in the above example code that says particularly that it applies "Single Line Text" - but it does and I don't understand why and how.