Hello Jan,
If the total height of Detail section is larger than the physical height of the page this might cause the blank pages.
Container items (sections, Panel) cannot shrink when the actual height of inner content is smaller than the container's height you set in the designer.
Also, check
KeepTogether properties of other report items/sections and set it to False.
More details regarding rendering and paging mechanisms are available in the following help article:
- Understanding Rendering Behaviors
- Understanding Pagination
On the side note, the ability to occupy the empty space (CanShrink property) was introduced in our latest R3 2016 Beta 1 release. You can give it a try by downloading it from your Telerik account (Downloads -> Reporting -> Latest beta).
If the issue persists please attach a problematic report in a support ticket so we can check the settings and provide you further suggestions.
Regards,
Katia
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