Hi Motasem
Thanks for Contacting Syncfusion Support.
We have checked the reported query “SListView does not appear when orientation is set to horizontal in RTL mode” from our side. Currently we does not have support for flow direction properly with SfListView. We already have a feature implementation task for the same which will be included in our Volume 4 main release which is scheduled to be rolled by the mid of the month December, 2018. We appreciate your patience until then.
Regards,
Jayaleshwari N.