Controlling page breaks, headings, columns, and rows in paginated reports (Report Builder)
Applies to: 
Microsoft Report Builder (SSRS)
Power BI Report Builder
Report Designer in SQL Server Data Tools
A page break divides a paginated report into separate pages for viewing and printing. Page breaks determine how the content is fitted to a report page for optimal viewing when you preview a report or export it to a different file format.
Adding page breaks also improves the performance of large reports when they are processed. A rendered page is displayed while the rest of the pages are rendered in the background. This allows you to begin viewing the initial pages of the report while waiting for additional pages to become available.
Page breaks can be added to report items such as a table, matrix, list, chart, gauge, or image. You can also add page breaks to groups in a table, matrix, or list. Page breaks can be added before, after, and between groups. Page breaks between groups are not added to the report by default.
For more information, see Display Row and Column Headers on Multiple Pages (Report Builder and SSRS) and Keep Headers Visible When Scrolling Through a Report (Report Builder and SSRS).
Note
You can create and modify paginated report definition (.rdl) files in Microsoft Report Builder, Power BI Report Builder, and in Report Designer in SQL Server Data Tools.