This is coming from the default theme style. I have un-checked both “Disable Default Fonts” and “Disable Default Colors” in WordPress. The green color on the sides (which you will see here: https://theaustineditor.com/test/) seems to be set as the page background and I cannot remove it via Page Settings – Style Tab.
Thanks for explaining this guys. I think I got it now… Gonna have to overhaul all my existing pages. Doing the GP +Elementor Pro combo may not have been the smartest idea but oh well.