PROC TABULATE is creating a summary report table -- usually a cross-tabular table -- there are no "observations" -- per se -- in a PROC TABULATE report table. Your observations go "into" TABULATE and what comes out of TABULATE is a summarized table. It would be hard to insert "reader breaks" into a PROC TABULATE report table in the same way that the BLANKLINE option works with PROC PRINT. There are other ODS techniques that you can use with TABULATE (such as banding -- discussed below).
What you see in this table are not "observations" -- it is summarized information based on this code:
proc tabulate data=sashelp.prdsale;
class region product country;
region*(actual*(min mean max)) actual*sum;
If I needed to make this table smaller or more readable, I'd consider these things:
1) using the PAGE dimension to put every country on a different page
2) using BY group processing to put every country on a different page