At work we have function generators from Siglent, Rigol, GwInstek and Keysight/Agilent.
What they all have in common is that their display shows the value that is set at a load of 50 ohms.
If the load is not 50 ohms, the actual value is higher.
New colleagues learn this "lesson" the first time they use these devices, they are surprised once, then you explain it and then they know.
It's quite simple.