I have two questions:
If possible and how to use all disk space? I have 120gb but it use only 7gb
If is possible set -mvolt like MSI afterburner to reduce power usage (I think it is powerstage but example i drop about -80mv on window what is it nearest value?)
Thanks
There is no such tool, you can only use Powerstage but i dint guarantee it will work.
It is image of 7GB drive so no more space. Also you dont need any more space.
Can I use SMOS and install Teamviewer or CPU mining?
Seriously Team viewer ?

You have all in simplemining dashboard. There never be any team viewer. Also it is graphica and RX OS doesnt have any gui, only text.
Also no CPU mining in near future. Right now electricity costs more than you earn on mining by cpu

Also cpu mining will casue problems with gpu mining, so not, i wont do this:)