Controlling how many lines are on a page before a pagebreak/formfeed in MailStream Plus

MailStream Plus™, all versions, all platforms
Yes, the PAGESZ parameter lets you control the number of lines.  There are separate lines-per-page fields for reports, the execution log, and Postage Statements.

For further information on PAGESZ and other parameters, please refer to the MailStream Plus™ Guide
UPDATED:  May 15, 2019