nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqwn8c84fe6hs6uav7n5vd6w0fuz4qtzqdt8cfksdr6t6r39rga2nqspehgy (nprofile…ehgy) georgia (nprofile…72y8) You can theme gtk unless it is libadwaita, the issue is that flatpak does not properly work with system themes. You need to also install the same theme as a flatpak.
Besides that, there is no use case for theming anyway.