3D Layer configurator not allowing new slices

I want to create a slice between slices 4 and 5 of my model. I want the values of Elevation remain as they are now in slices 4 and 5 and the new slice to be rightly in the middle. However, when I open the 3d Layer configurator, its format does not show the icons to introduce new slices, as it is shown in the attached document. The problem does not seem to be related with the fact that slices are Fixed. When I deactivate All Fixed at the bottom of the configurator, the  square Fixed in each slice goes empty but I am unable to change the status of the slices from fixed to movable or whatever. Regardless of All Fixed being active or inactive, the the bar with the icons to introduce new slices still does not appear, so I am unable to introduce any slice between slices 4 and 5 or any other slices. How can I solve the problem and introduce the desired slices? Emília Novo  

Hi Emilia, I think you are mixing up different FEFLOW versions. In toolbar with the multiple option to control the location and distance of the slices, it only supported in the latest FEFLOW versions. Best regards Carlos

I am not mixing versions because I created the model and the present slices with the same version of FEFLOW. So the problme must be something else

Or to better explain, it is the same FEFLOW version (version 7.0) with which I created the initial slices and now have this problem