In creative inventory if you select between Combat, Tools and Brewing and drag an Enchanted Book or Potions the Potion Effect GUI disappears.

In creative inventory, if you go between Tools, Combat & Brewing and the Potion Effects will not visible and if you select an item it will be visible.

When I select between Tools, Combat and Brewing it turns the text into white from black and when I select this 3 the Potion effect disappear and when I select an item again it turns back.