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From the Administration menu you can click on "Graphical options" under "Global settings":

Opigno 2.0 User manual > Graphical options > image2018-11-5_15-42-14.png

Opigno 2.0 User manual > Graphical options > image2018-11-5_15-43-10.png

Opigno 2.0 User manual > Graphical options > image2018-11-5_15-43-37.png

Opigno 2.0 User manual > Graphical options > image2018-11-5_15-44-10.png