How can I increase the size of these System Tray Icons? :

[![enter image description here][1]][1]

**Update:** In Debian 11, KDE Plasma 5.20.5, there is now an option to scale system-tray icons to the panel's height. Here's is a [short video][2] showing that. Thanks goes to KDE!


 [1]: https://i.sstatic.net/PrcMw.png
 [2]: https://youtu.be/U9lLAcVA-3Q