You can do this by following these steps:
Go to the “Pointer Options” tab.
You can change the mouse pointer speed using the slider in the “Motion” section.
Slide it to the left to decrease the speed or to the right to increase it.
Remember that the change is immediate so that you’ll notice a difference in the pointer speed right away.
Click on the “OK” button at the bottom.
Here are alternate methods:
Open Settings by pressing Windows + I.
Click on Mouse on the left sidebar.
Slide it right to increase speed and left to decrease speed.
Go to HKEY_CURRENT_USER > Control Panel > Mouse.
Double-click the MouseSensitivity in the right pane.
Enter any value between 1 and 20 in the Value data field. Keep in mind that the higher the value, the faster the speed.
Click the OK button.
Sign out and then sign back in.