Toolbar not hiding

Hello! I was trying out this plugin for a visualization and unfortunately the toolbar is not hidden even when I click on “Hide toolbar.” Instead, there is a small “B” that appears in the toolbar and when I hover over it it says “Debug mode: the text of this button indicates if we are rendering locally on the web browser (B) or if rendering is occuring server side (S).” Forgive me if I’m missing something obvious, I’m pretty new with this.