If you go into your task list on the Toodledo app, tap on "hidden tasks" on the top left side, then you will be able to choose to hide future tasks. I hope this helps!
I had tried that but future tasks were still shown despite the filter activated. I have just figured out what I was doing wrong. In fact I didn't activate the "Start Date" field in "Fields & Defaults". Now the future tasks are hidden.
Thank you for the help.
PS: The interface is a little confusing tough, I can't wait for the new version to be released again.