Translations:Kdenlive/Manual/QuickStart/39/en

Effects can also be added with the Add new effect icon (framed in the image on the left) in the Effect Stack; It always refers to the timeline clip that is currently selected. By unchecking the checkbox they are temporarily disabled (the settings remain though), this is e.g. useful for effects that require a lot of computing power, so they can be disabled when editing and enabled again for rendering.