Course Presentation

Course Presentation - Visible Screen Size

Hi,  why would the visible screen size on Course Presentation be slightly short of 100% both width and height? It leaves a gap right and bottom, not allowing an image to completely fill the presentation area, screenshot attached.

(I also find it strange that an image pre-sized to be full-size image is imported into the image area at a fraction of the size, meaning you have to stretch it back out again. The smaller image isn't always exactly the same image ratio to the original, we are talking tiny percentages out).

Shapes: cannot get 100% width

I'm trying to create a "header" region in my course presentation content by creating a rectangle shape with a white background.

When I resize shape and attempt to make it stetch the whole width of the presentation canvas, I am still left with a gap on the right-side of the shape:

When I inspect the shape element, I can see that container has a max width of 99.7821%: