The System Settings KWin rules page was rewritten from scratch and now features a much better user interface (Ismael Asensio, Plasma 5.19.0)
https://pointieststick.com/2020/04/24/this-week-in-kde-so-many-videos-for-you/
https://www.youtube.com/watch?v=UZx-F-CSIaw
https://www.reddit.com/r/Ubuntu/comments/g766in/kubuntu_2004_lts_with_a_bit_of_buntu_branding_on/
https://www.reddit.com/r/kde/comments/fui1v0/i_wrote_a_script_to_convert_a_stock_kde_neon/
https://www.reddit.com/r/kde/comments/fsxs4w/dark_plasma_theme_breezenoir_dark/