Simhub mobile phone, landscape

Hello, I'm using Simhub on some Android mobile phone, landscape view 

I tried with many mobile phones but same results 

Left and right, there are some black thick bars, with web browser ( Chrome) is the same.

I know, that's not a bug or something but I wonder if there is way to fix this, to have it on the whole display. 

Maybe some settings in the Simhub ( Windows PC )?? 

Any advices are welcome, thank you in advance