We managed to reproduce the issue locally only
using a concrete resolution with a 1.5 pixel ratio and have a width between 1366 and 1024. Then the height of the sheet where the report should be rendered is reduced which comes from a certain CSS rule in telerikReportViewer.css.
We would fix this in the next release, but meanwhile, the workaround is to go to telerikReportViewer.css file and manually comment/delete the following lines of code:
/* ----------- iPad Pro ----------- */
/* Portrait and Landscape */
To force a custom template with a custom CSS specify the templateUrl
of the HTML5 Viewer widget option - Styling and Appearance
If this is not the case, open a support ticket and attach the problematic project for further investigation.
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