I need to print to the edge of the screen as my page background is blue and I do not want to have to trim down lots of pieces of paper. I have tried editing the bleed option in page settings but it never allows me to fully print to the edge of the page. Can anyone help?
If I understood the question correctly, maybe you should check your printer configuration as everything that is inside the canvas area is exported. So, if there is anything cropping, it is not caused by Gravit Designer.
Is it using the same paper size as the canvas layout?
Export a 300dpi PNG file and use your default program for printing it instead of printing directly from Gravit. This should give you a hint about how to solve it.