Change versión php

Hello, I currently have version 7.4 of php, but it is giving me problems because I have codas installed that the maximum is php 7.2 and I would like to know how to change to another version, because from the panel I select it but it does nothing

v-add-web-php 7.2

Go to Web -> Edit domain -> Select “PHP-7_2 as template”

And save

After you do this what @eris says to you, please do a screenshot of your console so we can see and error (files missing)