You need to do a couple of things to accomplish this.
You must set up a custom menu which has nothing on it, and assign it to your
form (via the Menu Bar property in the Other tab of the form's properties
dialog). Check the Help system if necessary. One common trap is to not
set your new menu as a menu bar - it will default to a toolbar.
You must also turn off Allow Full Menus and Allow Built-in Toolbars in the
Tools - Startup options.
When you've done this, you won't be able to get to the normal
menus/toolbars when your database opens, unless you bypass the startup
options by holding down the shift key. So while you're getting it wrong -
and you will, unless (and even if) you've done it before - be perpared to do
lots of closing and shift-reopening of your database.
If you only want to get rid of the icons (which are on toolbars), and not
the menubar itself, then omit the bits about menus, just don't have any
entry in the Toolbar box in the form's properties dialog.
Experiment, and learn as you go ...
Rob
