Hello !
I've installed Zotero on my PC, but the plugin doesn't appear on the pre-installed LibreOffice Writer... Even if zotero website says that it should appear automatically afetr Zotero is installed.
Thank you for your help 
I don't remember if LibreOffice is installed as a Flatpak out of the box; that might be the reason it's not seeing the plugin.
Can you run this command in a terminal window?
flatpak list
If it shows libreoffice in the results, it's a flatpak. Next, can you describe how did you install Zotero?
Did you download the tarball or have you used zotero flatpak or zotero snap package? The best way is to download the tarball or use zotero-deb (if you have installed zotero flatpak or snap package please first remove them).
It may also help additionaly to switch to Xorg (logout and at login click on the cog wheel and set "Zorin desktop on XOrg")
If you have installed the flatpak of Zotero this instructions may help. But note that the flatpak is not supported officially by the developers:
On Zorin, LibreOffice is a native package, but Zotero from the Zorin software store is a Flatpak.
It's the 'containerization' around the flatpak which is causing the issue, blocking the integration, so you need to manually add the Zotero_LibreOffice_Integration.oxt item as mentioned in the Fedora forum discussion which @Forpli linked.
I know the guy who posted that solution for Fedora, and can confirm it works on Zorin too as I've used it myself.
There's two parts to the solution on the Fedora link... you definitely need to integrate the .oxt file, but you only need the Flatseal/Wayland part if you're having that window crash issue.
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