Hi @AlanBo,
Could you please share a screenshot about the issue within your app?
Could you please share a bit more about the searchable dropdown that you mentioned? Is it a Combo box control?
Further, which OS version is your mobile device? which version is the PowerApps Mibile App within your mobile device?
I have made a test, and the issue is confirmed on my side. Even when I run my app within PowerApps for web (in edit mode or play mode), the searchable dropdown (Combo box control) for the Person type column also does not work.
I would post this issue to my product team, if the issue is solved, I would reply here.
Best regards,
Kris