Thread Closed because it is old. it is from "January 09, 2017"
Instead of clicking in the correct panel, just press tab key if you need to change view.. select all is only needed if you run with Windows Explorer Styled setup. since it will auto set file in focus.
with commander style setup you do not need to selected all. since files are not auto selected
But, No There is no automatic constant folder sizing yet. Test with automatically constantly size all folders showed it affected the performance a lot.
However there are plans for some low prio background thread for this that will auto pause when other things need the performance. However that require quite a bit of work and will not be on by default