Older or educational versions of Fluidsim (especially 4.2) do not have a language option inside the main editing window. Instead, the language is set at the very start.
Ensure Fluidsim is completely closed .
Open the software and navigate to the Options or Runtime Settings menu. Festo Fluidsim Change Language
Displays all components with their identification (ID) and technical data. Older or educational versions of Fluidsim (especially 4