Ubuntu Customization

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Reduce Icon Size on the sidebar

1. Go to Settings, open Dock, change Icon Size.

Move Show Applications Icon to other side

sudo gsettings set org.gnome.shell.extensions.dash-to-dock show-apps-at-top true
    

References

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1. How to Customize Your Ubuntu Desktop
2. Move “Show Applications” right to left of the Dock in Ubuntu 18.04