Sabayon GNOME 3 How to Add Minimize/Maximize Buttons to Windows
The Guide shows you Visually How to Add the Maximize/Minimize Resize Buttons/Controls to Windows on GNOME 3 Desktop in Sabayon Linux.
And this Visual Guide includes the Basic Screenshots of All GUI Steps involved.
The Contents and Details are Targeted on Sabayon 13+ but if Instead, you Use a Lower Release then just Look around How to Install the GNOME Tweak-Tool on Sabayon ;)