Here is a quick snippet of code that can be used to reset the Debugger Window:

C_TEXT($tPath) $tPath:=Get 4D folder(Active 4D Folder)+"4D Window Bounds v"+Substring(Application version;1;2)+Folder separator+"coreDialog"+Folder separator+"[projectForm]"+Folder separator+"4ddebugger.json" If (Test path name($tPath)=Is a document)    DELETE DOCUMENT($tPath) End if

This works by deleting the Window Bounds file specific to the debugger.