Hide a field when another one is toggle

Hi,

I am creating a report with a Matrix and this report contain a collapse Matrix which it toggle from a certain field.

Now I am having two issue:

First issue is that when I set visibility to hide and that the matrix can be toggle by a field is leaving a very unaesthetic  space between rows.

I am attaching a picture to explain.

The second problem is that when I toggle the field I would like another part of the report to hide.

Does it exists anything that would allow me to define an expression I can use in the visibility that I Can use to make disappear this part of the report when the + has been toggle and make it appear back when the - has been toggle?

Thanks in advance

Regards

Federico