The "Direct Menu" is the assembly of ten most frequently used menu items. When you start yoshinoGRAPH for the first time, it is just ten blanks as below.
As you keep using yoshinoGRAPH, it automatically counts how many times each menu item is selected and the most used items will be listed as buttons.
You can hide the "Direct Menu" and change its style on the "Preferences" window shown by [Help]-[Preference]. Users cannot edit the "Direct Menu" manually.