Uninstall all the flatpak packages that are installed as system wide packages and install them as user packages, that way flatpak will use your /home partition. I had the same problem.
By default I have the same issue using KDE and a dark theme, what I do is set a specific theme inside LibreOffice. Another thing you can look for is setting another GTK theme or color scheme inside Customization on Plasma Settings
i know this is a shitpots but that's 🇳🇮 Nicaragua or 🇸🇻 El Salvador flag
Uninstall all the flatpak packages that are installed as system wide packages and install them as user packages, that way flatpak will use your /home partition. I had the same problem.
First photo
iswas from Colombia 2021 riotsEdit: thank you for the fix
Install it, use it, love it
By default I have the same issue using KDE and a dark theme, what I do is set a specific theme inside LibreOffice. Another thing you can look for is setting another GTK theme or color scheme inside Customization on Plasma Settings
Use another theme, look for them in Tools->Preferences
Nice, really liking the sunglasses texture