The panel i'm talking about resides on the right side in gnome applications overview (just pressing super key).
In standard gnome environment if you set static workspaces to 1 in gnome-tweak-tools - the right-side workspaces panel are gone. But in Ubuntu - even after using tweak-tools it still appears.
Are there any method to annihilate this panel without using additional extensions ?
UPDATE
Some investigations showed this two functions (alt+f2 -> lg) to annihilate the panel, but i think there is some more elegant method...
Main.overview._controls._thumbnailsSlider.actor.destroy_all_children();
Main.overview._controls._thumbnailsSlider.actor.destroy();
I am using Ubuntu 18.04, however with the vanilla gnome session. If I set workspaces to "static" and numbe of workspaces to 1 in Gnome Tweaks, the workspaces indeed are gone as you indicate.
That it does not work for you may be related to the fact that you are logged in to the customized Ubuntu session.
You can install
gnome-session
to have the choice for a plain Gnome Shell session on login. That is what I run. For your information,vanilla-gnome-desktop
is a session that takes it one step further. It mimics the former Ubuntu Gnome edition with a full default Gnome environment, including all Gnome apps such as Photos, Documents, and the Gnome browser Web.