Hi Diego,
Basically, you can access to the HTML element of Feedback Message and remove it.
For instance, that code will close the message after 5 seconds.
After FeedbackMessage action call RunJavascript action with following code.


SyntaxEditor Code Snippet
"setTimeout(function(){
if (document.getElementsByClassName('Feedback_Message_Error').length > 0)
{
document.getElementsByClassName('Feedback_Message_Error')[0].remove();
}}, 5000);"
Hope it helps.
With best regards,
F.Karatay