Click on the "Colors" tab
Change the background colour.
On the iPhone, it is by default already black, but on an iPad the default is white and unfortunately, you can't change it (at least, I have not found a way)!
PS! You can "invert colours" on the General iOS setup, but that will affect all apps, which is not exactly a solution!
How to change bg color for mt4 iOS/ipad from white to black ?
Why does not the company add this feature. Our eyes are broken.
I found solution for you. I use object "rectangle"