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Hi Nicola,
It’s likely been installed as a “must use plugin“. You’ll need to move the plugin from the mu-plugins folder to the plugins folder whereby it’ll appear in the plugins menu as normal allowing you to go through the normal uninstall process.
However I must stress that there’s a risk of you breaking your site if this is done incorrectly. If you’re unsure I’d recommend reaching out to whoever installed it as an mu-plugin.
Because this isn’t a bug with the plugin itself I’m going to close this. I hope this info helps!
Cheers,
James