That is where I found the reference to the undo-queue. Take a look at the grab to see what I am trying to do. The undo button is white on my ‘dark’ theme. I turned both the i-frame and the plot transparent so I could composite transparent dash graphs onto the dark theme.
The only thing sticking out is the undo button.
How can I remove it? (The /assets/my.css approach crashes my code).