There are 2 or 3 ways to remove one of them. See the image below:
If it is a Magix effect and it has been applied and you have the effect open as shown, click on the X;
For all effects, in the keyframe area, uncheck the box at the left to turn the effect off. It is still there in case you change your mind and want it back. If there is a > beside the check box, this means that there is more than one effect with the effect, like X and Y. Click on it to see the sub-effects.
For all effects, in the keyframe area, click on the popdown to the right of the text and select Delete effects. It only deletes the selected effect.
There are things like this all over the place and there are right-click menus for many things. Try them and learn.