Fullscreen button made in UE5.5 doesn’t hide address bar in Pixel Streaming

Development Programming & Scripting UI
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Hi, I’m using Unreal Engine 5.5 with Pixel Streaming.
I created a fullscreen button inside UE5. It successfully toggles fullscreen, but on mobile and desktop, the address bar still stays visible, so it’s not true fullscreen.

How can I make it go completely fullscreen (hide the address bar) when using Pixel Streaming?
Do I need to handle this through the JavaScript frontend, and if so, how should I set it up?

Thanks in advance!