gnome-shell-extension-activities-configurator

Activities Configurator gives you all sorts of options to control the look and feel of the top bar and Activities button in GNOME Shell, possibly even overriding your current Shell theme. You can change or remove the Activities button text, add an icon, move it to right corner, change the top bar's background color and transparency... You can toggle the Overview if no applications are running (at login and whenever the last application window is closed). You can also adjust the "pressure" threshold for the hot corner, or disable it altogether.

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