I Disabled Present Window
System Settings > Desktop Behaviour > Desktop Effects > (Disable) Present Windows
I also disabled Taskbar (Panel) Tooltip
Right Click Panel > Configure Icon-Only Task Manager > Uncheck Show tooltips
So, When I click on an Group Icon on the task manager, it probably shows
How can I make this list larger so that it gives full details.
Something Like -
PS: I made up the second image from Task Switcher* to give a rough idea.
[*] System Settings > Window Management > Task Switcher > Informative instead of Breeze