How can I adjust the opacity of an image that I added directly inside a glyph in Glyphs?

I added the image via “Add Image” inside the glyph edit view, but I can’t find the Inspector panel to change its opacity. Where exactly can I adjust the transparency of this kind of reference image?

That is not exposed in the UI. You need to use a script for this.
Run this in the Macro window.

Layer.backgroundImage.alpha = 25
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There’s a script in mekkablue > Images