Cannot change heading to regular text in Milkdown editor #8

Once you have a heading, there doesn't seem to be a way to change that heading to regular text. For example, the heading "Lorem ipsum" below can't be changed to regular text unless you switch to raw plain text and manually remove the # charater:

Looking at the official Milkdown playground, it seems that would be possible when clicking the "..." button next to the heading, but that button doesn't appear with the Standard Notes plugin: