I added some fields to do some tests and I realized that it is not possible to delete them but only make them invisible, the fields created when I installed the plugin are not even editable, once the changes are applied and I click on save, if I reload the page, everything goes back to how it was before.
if I click on delete, it tells me "error" and does not delete anything.
solutions?
ps. the first created fields were made like this
<font color=#F87431>Name</font>
the second ones only with the name of the field.

i'm using the standard short code, also because if i set the bootstrap version the field appear with all the color string on it, but since i can't delete them i set it again on standard at the moment.