First be sure you are in Memory mode. If the channel is on the left side, press and hold the [LOW] key on the "left" side of the radio for 1/2 second to switch the display between Alpha (Name) and Frequency.
If the channel is on the right side, press and hold the [LOW] key on the "right" side of the radio for 1/2 second to switch the display between Alpha (Name) and Frequency.
By default, the P4 button of the microphone will do the same toggle when pressed and held for 1/2 second. Considering the P keys can be reprogrammed, I don't know if this still works if the key is no longer set to defaults.... but I bet it does.
If the channel is on the right side, press and hold the [LOW] key on the "right" side of the radio for 1/2 second to switch the display between Alpha (Name) and Frequency.
By default, the P4 button of the microphone will do the same toggle when pressed and held for 1/2 second. Considering the P keys can be reprogrammed, I don't know if this still works if the key is no longer set to defaults.... but I bet it does.