I think the best you can have is the hover/click effect
https://docs.xfce.org/panel-plugins/xfce4-docklike-plugin/start
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
I think the best you can have is the hover/click effect
https://docs.xfce.org/panel-plugins/xfce4-docklike-plugin/start
Ok
I would like to see Thumbnails ( preview of current window ) instead of Icons in the Dock / Panel.
Yeah me too, that would be very nice to have. I was able to make what you have without Docklike Taskbar:
I have tried Window buttons already. For me, it misses : Pin to Dock Super+N shortcut
The activity indicator looks nice , though.
Yeah I also had that "issue" with it. That and the fact that it kinda makes minimized applications transparent for no reason, but when I'm running xfce4 is to have performance and I'm not sure I want to install another extension. Btw, how does Docklike Taskbar play with having the clock, and the status tray on the right? Can it do it?
I have seen it with some Dock/panels, but the specific DE/tools you mention is not something I have used.
check the project page for the panel you are using.
Can you confirm the Dock/Panel you have seen, with this option.
https://docs.xfce.org/panel-plugins/xfce4-docklike-plugin/start
shows the preview feature you mention.