In order to turn on/off the UI switch you must use the below instructions.
Go to Administrator dashboard
Select Admin settings
Search for cp_display_old_ui
Set to Y for on and N for off.
Click OK
How do I turn on/off the indicator for classic UI switch?
In order to turn on/off the UI switch you must use the below instructions.
Go to Administrator dashboard
Select Admin settings
Search for cp_display_old_ui
Set to Y for on and N for off.
Click OK