Hello,
1) Update Elementor Pro to the latest version https://elementor.com/pro/changelog/ because version you use now causes issues with the section stretch option and after that use the section setting to make it stretched if you need https://gyazo.com/8864a69371496b87c0a306983c711ec2
2) Enable Elementor to edit Static blocks https://prnt.sc/1ucikdx and edit footer static block according to your needs using Elementor. https://youtu.be/gY-x4m47Duo
Regards