You'll need to remove several art and themes packages. Before you do so, you should install a theme package for LibreOffice. There are several:
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libreoffice-style-human - office productivity suite -- Human symbol style
libreoffice-style-tango - office productivity suite -- Tango symbol style
libreoffice-style-crystal - office productivity suite -- Crystal symbol style
libreoffice-style-galaxy - office productivity suite -- Galaxy (Default) symbol style
libreoffice-style-hicontrast - office productivity suite -- Hicontrast symbol style
libreoffice-style-oxygen - office productivity suite -- Oxygen symbol style
The default one should work fine, though note that libreoffice-style-oxygen is broken. Once you have installed one of these, you can remove the Linux Mint themes packages without the side-effect of also removing LibreOffice. (Like mint-themes, all these packages provide to satisfy the "libreoffice-style" dependency of LibreOffice--there may be other themes packages that provide this.)
The packages to remove are at least:
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cinnamon-themes mint-artwork-cinnamon mint-artwork-common mint-artwork-gnome mint-backgrounds-petra mint-themes mint-themes-gtk3 mint-mdm-themes mint-x-icons
The Cinnamon theme is part of cinnamon-common and thus I doubt you have to remove this one, so on System Settings > Themes you'll see you will default to the Cinnamon theme (unless you have others installed and active). On System Settings > Themes > Other Settings you'll see several themes have been reset to Adwaita and icons have been reset to gnome. To have other options here, install Gtk+ and Gtk3 themes, and icon themes.
Before you log out or reboot, either install a MDM HTML theme or open Login Window and set Style to GTK. Else MDM will cause problems next time you log in as it's set to use a HTML theme but there aren't any installed...