In VR, you should better go for a TextRender Component, because while the Print String does print the content, it prints this at a position, you might just not see in your headset.
You also can just print to log and check the logs, if that’s an option (not really good for realtime)
Another quick hack: just use an Append node and insert some blank lines before your actual string (Shift Enter).
Or add a UMG Widget to print content.