It would seem that they are up to something in the spotlight studio as tonights edition had the weather CSO screen moved across from right side as we look at it to left. So rather than three CSO screens in the studio, including the one behind the presenters , there was only two.
There are only two CSO screens in the studio. One behind the main desk and one in the middle which is used for the weather (except at breakfast) and 'standing' reports.
The screen in the 'soft/breakfast area' is back-projection and is only used for the weather during breakfast. During the evening it's used for the looped 'Barbican' video or report specific graphics.
The weather CSO screen appears on the left when being introduced from the main desk (ie at lunchtime & currently during the evening while they are 'sans sofa'). When they used to introduce the weather from the 'soft area' the screen appears on the right.
The set certainly looks cutdown from what it usually is. Perhaps this is a temporary set and they are constructing a new set, or perhaps they have a separate breakfast set and a separate Politics Show set all in the one studio.
Normally they use long shots of the studio (as above) to give an impression of size. But as the 'soft area' isn't being used in the evenings at present then there is no point showing it, hence the rather tight shots showing just the desk and weather CSO screen.
The Politics Show has always come from the same studio (there is only one). The set sits in front of the fixed Spotlight set, around the back-projection screen in the soft area.
Apparently the sofa is "coming back soon" (although not the same one). There doesn't seem to be any explanation yet as to why it was removed. Whatever they are doing isn't visible on screen.