DocumentationMathematicaDemosNotations...Options and Tags
The option AutoLoadNotationPalette
The option AutoLoadNotationPalette and its behavior.
If you are designing a package you may want to hide the notation palette when the user loads the Notation package so as not to confuse them. You can set the boolean variable AutoLoadNotationPalette inside your package to achieve this. If AutoLoadNotationPalette has been set to False then the notation palette will not be loaded when the Notation package is loaded. If the value is undefined or True, the notation palette will be loaded when the Notation package loads. In input form the statement would look like the following.
Statement forcing the notation palette not to load when the Notation package loads.