Unexpected Overlay in the Bottom-Left Corner of the Site

While exploring Discourse, I noticed a recurring overlay appearing in the bottom-left corner of the website. It shows up across different forums and seems to contain some kind of data or debug information.

I have been unable to locate which element is generating it, which makes me wonder what exactly it is.

What does this overlay indicate? How can I disable it? Is this a bug?

Seems to be a box of gadgets: a theme chooser, a light/dark mode selector, a + which allows to add gadgets, and finally a button to show the keyboard shortcuts.

Edit: perhaps see
Sidebar Theme Toggle

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I believe the interface color selector is the one that adds a light/dark mode toggle to the sidebar. The setting can also be changed to display the toggle in the header.

The + sign allows users to add custom sections in the sidebar.

I’m not talking about the UI of the interface, but the strange overlay, those gray dots and lines.

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There’s a gradient there so that when the sidebar content goes off the screen, it seems to fade out. Gradients can sometimes produce strange dots or lines like that.

If you have access to the forum’s theme, you can disable it with something like this:

:root {
   --d-sidebar-footer-fade: transparent;
}
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