To remove Footer on just One Page, you can use these options.
#Option 1.
Hover on Page Name > Click Gear icon
Click Navigation > You will see an option to remove Footer here
#Option 2.
You can also find Page ID
Then use code like this to Custom CSS.
#item-673e9a14857d4032d3e2f2d9 {
footer.sections {
display: none !important;
}
}