Open Settings app, then go to “General” and to “Trackpad & Mouse”.If you want to change how fast or slows the cursor moves on the iPad screen, you can do that easily: How to Change Mouse Pointer / Cursor Tracking Speed on iPad

You’ll find that onscreen items like icons and menu bar items react to hovering over them with the mouse, typically either becoming highlighted or enlarging as the cursor hovers over them. Now that the mouse is working with iPad, you are ready to use it with iPadOS. When the mouse / trackpad is shown as “Connected” it has been successfuly paired, and the mouse will work automatically on iPad.Tap on the mouse / trackpad when it appears in the “Other Devices” list at the bottom of Bluetooth Settings.Place the mouse or trackpad into pairing mode (usually this means holding down a button on the underside of the mouse until a light starts blinking on it, or something similar).Open the “Bluetooth” settings and make sure Bluetooth is on.To start using a mouse or trackpad with iPad, you’ll need to pair it with the device first: How to Pair a Mouse or Trackpad with iPad

Use a mouse with ipad mini 4