Created attachment 111834 [details] transition properties make them unreadable on arch linux w/ mate.
Please try with the actual Kdenlive AppImage version 18.08.2 Run the Appimage from the terminal (press CTRL + ALT + T). Move to the AppImage folder and run the .AppImage: ./Kdenlive*.AppImage
This is fixed with the current version 20.12.2. Text is good visible. Feel free to reopen this bug or create a new report if this is still happening with the latest version (https://kdenlive.org/en/download/)