在gnome中最小化动作的问题

I am fond of Ubuntu Unity version and this is the first time when I am using gnome with the Ubuntu, and I found that minimize action is disabled by default so I enabled it by using gsettings set org.gnome.shell.extensions.dash-to-dock click-action 'minimize' then I opened nautilus (file manager) then i click on other locations on left menu bar then two new icons (bottom two as given in image) of my two paritions came on my launcher so when I try to minimize one of the window of my partition, a new nautilus window comes instead of minimize.
I am trying to minimize the window by clicking on second bottom icon given in below image.
You can see the two extra dots shown on nautilus icons and its partion.
enter image description here
I am using Ubuntu 20.04 and I think this bug isn't specific to only this version.
and can anyone tell me that why Ubuntu-gnome always comes with the disabled window minimize action ?
As Ubuntu has stopped delivering the Amazon app then Why Ubuntu is not delivering with already enabled the minimize action of window ?

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