Hello,
1) Go to Pages > edit the “Contact us 2” page using Elementor and either edit the elements or remove them https://prnt.sc/105mybb
2) To change the footer Static block go to Appearance > Widgets > Footer widget area and choose the block you want to show https://prnt.sc/105n524 . Don’t use custom footer in the page settings if you don’t want to show it for this page only https://gyazo.com/1e11c2a1b338cd5b529b633eac30c5cd
Regards