If you're looking to hide the ToolBar on your Android device, there are several ways to do so. The most straightforward way is through the Settings app. Open up your Settings, then scroll down and tap Display. From here, you'll be able to switch off or adjust the ToolBar visibility for certain applications. Additionally, depending on what version of Android you're running, there may be a dedicated toggle button for ToolBars found in Display settings.
Alternatively, some launchers offer options that allow users to customize how they interact with their home screen experience - including hiding or disabling unwanted elements such as the ToolBar. This option can usually be found by long-pressing an empty area of your home screen and accessing launcher settings from within the menu which appears afterwards.
Finally, if all else fails (or if none of these methods work), it's possible to disable system UI elements like your ToolBar completely using apps such as ADB commands or Xposed Framework modules; however this requires advanced knowledge and use of root access privileges so it should only be done after considering risks carefully!