Really simple – create a new module and create the following simple functions.
I usually name them TurnMenuOn and TurnMenuOff.
Public Function TurnMenuOn()
Application.CommandBars("Menu Bar").Enabled = True
Public Function TurnMenuOff()
Application.CommandBars("Menu Bar").Enabled = False
Then you can run at start up by creating a macro that is titled autoexec
And using the Runcode action call the TurnMenuOn() function alternatively you can call it from the form opening.
It is often useful to create a couple of straight Macros that run these functions as well so that when you are in design mode you can quickly run the functions.