Can't change the logo

how is your maintenance-page styled. is it a page with transparency header? and your normal Pages not.?
Enfold got two logos to insert on Enfold Options – the one – major Logo and one for transparency headings.
This can be found on Header – Transparency Options.
Maybe this is the reason for.
A life link would be nice to be shure

But this is normal content –
What page is defined as maintenance-page on your Enfold Options – Theme Options ? on : “Redirect all users to this page”
you only have to edit that page and replace the image ( that has nothing to do with the logo )
it has to be in the second column (1/2) after the 1/4 container

By the way i would not display the bread-crumbs on that page too

What page is defined as maintenance-page on your Enfold Options – Theme Options ? on : “Redirect all users to this page”

Dashboard – Pages – see where that page is
or if you see on top the adminbar on your maintainance page – click edit

it is your page-id-3391

And you have no disturbing Gutenberg Editor at all ? ( Enfold Options – Theme Options : “use WP Classic Editor” )
you are in the editor Modus of your Page now and you see the Advanced Layout Builder Editor ?

you must see something like this ( click on it to enlarge ):

above the heading there is a transparent container with a white image in it : click on it – a popup will open with options to change or replace the image

I think that there will be not all things loaded from the demo.
Drag and drop out your Heading. Delete the 1/2 container and create a new one. Put in your Heading and pull in an image above the heading.