That would be a nice option to have!
As a temporary solution you can insert some CSS with a plugin such as this one: User CSS - Chrome Web Store
This CSS will remove the whole box, including for when buttons are clicked:
div[data-coda-ui-id="snackbar"] {
display: none;
}
Remember to turn it on!
I’ve got an idea to make experimental fixes like this easier to activate, I just need Coda to answer me: A CSS injector browser plugin for Coda