Login Screen not Scaling

Support Xfce
1

I use Windows Manager to set scale to 2. The desktop look good. However,

  1. The login screen is not scaled at all (even for lock screen)
  2. The theme is inconsistent. The preinstalled gcolor2 app is NOT scaled. But if I install the gcolor3, the close, min, max button has different style than Terminal/FileManager.

How to fix them?

2