Activating theme GTK To activate the theme in Gnome, run the following commands in Terminal:

gsettings set org.gnome.desktop.interface gtk-theme "theme-gtk-dracula"
gsettings set org.gnome.desktop.wm.preferences theme "theme-gtk-dracula"

or Change via distribution specific tweak tool.

Activating icon theme To activate the theme in Gnome, run the following commands in Terminal:

gsettings set org.gnome.desktop.interface icon-theme "Dracula"

or Change via distribution specific tweak tool.