you can control automatic word wrap. Unit used is pixel. @startmindmap 15.8.1 Activity @startuml 15.8.1 Activity @startuml 21.8.1 Activity @startuml 20.8.1 Activity @startuml 21.8.1 Activity @startuml nwdiag { Guía de Referencia del Lenguaje PlantUML (1.2023.11) 280 / 530 lightGreen LineStyle 8.0;3.0 LineColor red LineThickness 1.0 FontSize 16 FontStyle bold FontColor purple Margin 5 Padding 20 } timeline { BackgroundColor Bisque } closed { BackgroundColor pink FontColor red } Separator title -- [M1] happens on 5 days after [Task1]'s end -- end -- @endgantt Guía de Referencia del Lenguaje PlantUML (1.2023.11)