screenTimeoutMillis

Specifies the duration that needs to pass without user interaction until the screen is turned off. Use PdfUi.TIMEOUT_DEFAULT for the system default timeout and PdfUi.TIMEOUT_INFINITE to deactivate automatic screen off. Please notice, that this setting only works out of the box only if you're using PdfActivity (or a derived class from it). In case you're using PdfUiFragment you can forward Activity.onUserInteraction from your activity class.

@Override
fun onUserInteraction() {
    super.onUserInteraction();
    pdfUiFragment.implementation.onUserInteraction();
}