Change keyboard disappear in one ui 6

[Jerry96]

When I was using oneui5. I was able to switch between keyboard in the notification bar. But now that option disappeared. 

Any one know how do I turn that on again? 

[Helenna]

Hi, I request you to please follow the below steps once and check again.

Here is the path:

Power the device off.

Press and hold the Volume Up key and the Power key.

Navigate with the Volume keys to the wipe cache partition option and press the Power key to select.

Performing a wipe cache partition removes any temporary files that may be causing an issue with the device.