Have a new HP with AMD-10 processor. Installing 42.2 with default partitioning, after first reboot (and power cycle) only WIN 10 comes up, no grub screen to choose OS. Then fiddled with the partitioning a bit: reformatted /home and / partitions. Same result.
I don't see in this partitioner a way to set a partition to "bootable" as I recall from previous versions.
I'm not very familiar with EFI. If I delete all the Win 10 partitions and go with openSuse alone, will the install disk take care of EFI?