This is a small topic. I think this is a cute bug.
Following operation, show "Filter Applied" on status bar without filter. -1. Select filter "User Setting". -2. Show "Auto Filter Option". -3. Click "Cancel". -4. See status bar, there is "Filte Applied". (in Japanese Edition, show "フィルター中")
You can clear status bar with following operation. Select "Clear All Filters", or select "All Tasks".