Firstly thanks for all the hard development work in SMath Studio - it's a cracking tool.
I thought I'd post this because it took me a while to work out - probably just me being a bit thick but just in case anybody else is having a similar moment:
Once I'd inserted either an area or a separator (from the insert menu) I couldn't work out how to delete it if I changed my mind - if I clicked on the area bar or the separator bar so that a black box appeared around it then the delete key didn't do anything and if I right clicked on either object then the cut, copy and delete options were all greyed out.
It turns out it's quite simple to delete the separator or area - just hold the left mouse button drag over the area / separator bar so that it gets highlighted in blue - once you've got it highlighted in blue then the delete key or right-click and delete works fine.
It's pretty obvious in hindsight and consistent with the way SMath Studio works with all of the other objects on the page; just thought I'd post it in case anybody else is being as dumb as me!
Lucky you if you feel thick pedalling Smath ! Me, pedalling Smath: my brain liquefies !
Plug something in an area, collapse ... to delete: brush over left mouse down to get the blue highlight press "Delete" button on keyboard => gone Same thing for the separator.