User`s guide

Remarks
Clearing the text message does not override the display state (see
DISPlay[:WINDow[1|2][:STATe]] command); if the display was disabled
prior to clearing the text message, the display will remain disabled.
If the text message was displayed by overriding a displayed measurement
or math function, that function will reappear when the text message is
cleared. In the case of the second display line ("WINDow2"), the <feed>
selected by DISPlay:WINDow2:TEXT:FEED will reappear.
The front-panel display is automatically cleared when power is cycled, after
a Factory Reset (*RST command), or after an Instrument Preset
(SYSTem:PRESet command).