There will be multiple debuggers, one for each app. Because the debuggers have a fixed position, they will overlap and you can only easily interact with the top most one. But each debugger works as normal.
You could use a contain - CSS: Cascading Style Sheets | MDN property on the parent element of each of the apps to create a new containing block so that the fixed position is not relative to the viewport but the to the parent element.
This works well, but only when the CSS in the apps to not depend on the viewport to be the containing block.