Partly the answer depends on your destination. In the LISTING destination, you could use Linesize and Pagesize options to tell PROC REPORT how wide or narrow the report row should be. You can also use the ID attribute on the DEFINE statement to say which variables should appear as "identifying" variables on a wrapped report.
If you are dealing with ODS HTML and HTML output, however, the report can be as wide as it needs to be.
If you are dealing with ODS RTF and/or ODS PDF, then you might wish to search the forums for the string "very wide". There have been previous forum postings that show how to change the font_size, cellwidth and cellpadding for RTF and PDF in order to "scrunch" a very wide report horizontally.
I didn't mention PAGE because it works differently in ODS destinations than in LISTING:
In listing destinations, a PAGE option on the DEFINE statement causes PROC REPORT to print this column and all columns to its right on a new page. However, for ODS MARKUP, HTML, PRINTER , and RTF destinations, the page break doesn't occur until all the rows in the report have been printed. Therefore, PROC REPORT prints all the rows for all the columns to the left of the PAGE column and then starts over at the top of the report and prints the PAGE column and the columns to the right.
(from the DEFINE statement doc)
...which may be undesirable to rely on if you plan to eventually use ODS for the report.
Nothing in your template (a STYLE?? template) would have an impact on these PROC REPORT options.
The fact is that the option, as explained in the DOC, will NOT work in PDF as it does in LISTING.
This is probably undesirable behavior. You may want to search the forums for the previous posting on dealing with very wide reports.
These changes may result in fitting your output on the page:
1) changing PDF orientation to landscape
2) changing PDF margins
3) changing the papersize to legal
#1, #2 and #3 go on an OPTIONS statement
4) changing the table cellpadding to be smaller
5) changing the table fonts to be smaller (the very wide program posted previously showed the impact of changing fonts)
5) removing interior table lines