I don't know since when, but I can't have wobbly windows enabled. In desktop effects, it shows under not available in this compositor (in spanish)
raul ~ $ inxi -G
Graphics: Device-1: Intel HD Graphics 620 driver: i915 v: kernel
Device-2: NVIDIA GM107 [GeForce 940MX] driver: nouveau v: kernel
Display: x11 server: X.Org 1.20.5 driver: intel resolution: 1920x1080~60Hz, 1920x1080~60Hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 620 (Kaby Lake GT2) v: 4.5 Mesa 19.1.2
Im using Opengl 3.1 as Compositor, and forced uxa acceleration
raul ~ $ cat /etc/X11/xorg.conf.d/20-intel.conf
Identifier "Intel Graphics"
Option "AccelMethod" "uxa"
Option "DRI" "2"
What can I do to enable wobbly windows? I remember not long ago that could be enabled.