In symbolic calculation (by using symbolic operator "explicit") I can not set the number of decimal places for intermediate results. The option "Apply to symbolic results" (in main program menu select: "Format" -> "Result" -> "Number Format" -> "Apply to symbolic results") was available in Mathcad 15 (see the attachment for details). And it seems that, in Prime 2.0 this is not possible. 
Mathcad 15:
Mathcad Prime 2.0 (and the fourth line in this listing was obtained by converting the Mathcad 15 file to Prime 2.0):
