I'm not certain that I understand your inquiry, but I will try to offer some assistance assuming that you wish to control the background color of your page:
Step 1) Press F4 to open the properties for the objects on your page.
Step 2) Navigate to the page itself and click on the (custom) properties - which will display the "Main Page Setttings Dialog".
Step 3) Click on "BackColor" square and a color dialog will pop up.
Step 4) Choose the color you want and and click OK on the Main Page Settings Dialog and you will see that your page will change to that color.
You could also just double click anywhere on your page where there are no other objects. That will also cause the main page settings dialog to appear.