This is the only way to get a "native" dark look in FileZilla without third-party tools, though it affects your entire desktop. Seriously, where is the dark theme ?? - FileZilla Forums
FileZilla Pro and newer client versions automatically follow your macOS system-wide dark mode . filezilla dark theme upd
Since FileZilla inherits its look from the OS, you must change your system-wide settings: This is the only way to get a