Hide Specific Running Applications from Dock (Side Bar) on Ubuntu 18.04

Question

I want to make secret recordings and I would like to hide only one application, for example, Cheese, which makes video recording. Does anyone know how to do this?

Answer 1

Do:

xprop | grep "CLASS"

and click on the window you want to remove from taskbar.

This will return something like

WM_CLASS(STRING) = "name", "name"

Install wmctrl

sudo apt install wmctrl

Make a program startup script or run once, depending on your preference:

wmctrl -x -r name.name -b add,skip_taskbar

Sources:

• https://askubuntu.com/a/798408/1520512
• https://forum.xfce.org/viewtopic.php?id=6755
• https://bbs.archlinux.org/viewtopic.php?id=133254
• Google

Answer 2

It is not a definitive solution but it works. I used the dconf-editor program to hide running applications, as shown in the image. Those that are running but I do not want to hide, as is the case of Google Chrome that appears in the image, I fixed it on the dock.