Trouble with Homepage and Pages Theme

Hi everyone,
#1. I have been really struggling with this. I used elementor to design my homepage adding the ‘Latest Blog Articles’ section. The issue is on the bottom I get my original theme automatically displaying under. How do I remove the latter from displaying?

#2. When clicking on the other pages in the menu it also automatically goes back to the original theme, which I find hideous. How do I override everything with Elementor?
Note: The mega menu I made includes a menu + header; I do not want the header appearing on the other pages- just on the homepage. I just want the other pages to have the menu.

*I tried going to ElementsKit- Header Footer- selecting singular- front page. But this shows up the problem I discussed in #1.
If I select conditions: entire site. This adds the whole menu and header and I don’t want the header showing up on every page.

I tried resolving by creating a new template in elementor with just the menu (to be added to all pages other than homepage); hoping I could display it but couldn’t figure out how to display conditions.

Am I supposed to be using mega menu just for creating the menu in elementor or also for adding theme to entire website? If it’s just for creating menus then I dont see how to edit the theme with elementor as it’s appearing for pro only.

The page I need help with: [log in to see the link]