I just started using the KDE launcher instead of the Unity launcher in Ubuntu 16.04. It looks very nice, but, since I have a very large screen (4k, indeed), the UI elements look very small. In Unity launcher, there was a setting for this. In KDE, you can't directly magnify the desktop, but you can change the font size, etc. However, I have had a little trouble with scaling apps like Chrome. Is magnifying the UI of Chrome possible, or do I need to use another browser?
Edit: since I'm using Ubuntu 16.04, my version of KDE is 5.18.0