I've only used the Android version,....you can add & remove your own content from the viewer, but the sample files are part of the software, which you can switch the display of these to "Show or Hide" via the options. HTH.
Design Manager Streetscape Ltd
Solid Edge ST10 [MP2] Classic [x2 seats]
Windows 10 - Quadro P2000
Yeah, you can't delete the samples, but you can hide them. Go under the tools settings on the ipad and go down to SE mobile viewer and then check to hide samples.