How can I delete empty space in screens?

Hello
I want to delete the space (red drawn), but want to keep bottom navigation bar.
Bur I coudn’t find any option for that.
Can someone help me? Thank you

Hi,
You need to disable the ‘Safe Area’ of the page in the “Style” tab on the right:

image

And disable the Header bar in the “Navigation” tab in the Toolbar.

image