In some situations you may wish to disable page breaks in SSRS report, such as when displaying report as part of web page (for example, inside SharePoint).
To do this, you need to set Interactive Height to 0.
Select Report Properties, and go to InteractiveSize property. Change height to 0. You’ll get a message saying “Setting interactive height to 0 may have a performance impact.”. Click OK to close the message. Save your report and run it – page breaks are now gone.