Easiest Way to Open Files as Root in GNOME Files
In Windows, you generally get an option to open a file or folder as "Open As Administrator" in the right-click context menu.
That feature is part of the File manager, i.e. for Windows; it's part of Windows Explorer. However, it is executed by the operating system and its permission control modules.
In Linux distributions and file managers, the situation is a little different. The different desktop has their way of handling this.
Since modifying the files and folders as admin (or root) is risky and may cause a broken system, the feature is not easily available to users via the GUI of file managers.
Here's the simplest way to access a file or directory as root in GNOME Files.