Add this script to Options > Workspace > Run...
// script "Set LA window title.cs"
/*/ role editorExtension; testInternal Au.Editor; r Au.Editor.dll; /*/
string baseText = "LibreAutomate" + (ScriptEditor.IsPortable ? " (portable)" : "");
bool once = false;
FileNode prevFile = null;
App.Timer025sWhenVisible += () => {
var f = App.Model.CurrentFile;
if (!once || f != prevFile) {
once = true;
prevFile = f;
var s = f == null ? baseText : $"{baseText} - {f}";
App.Wmain.Title = s;
}
};