Does the subject want to ask "What is the function of the built-in menu bar in Hungry Field?" Functions include: knapsack management, skill upgrading, production synthesis and combat operation.

1, knapsack management: The built-in menu bar can be used to manage players' backpack items, including the use, splitting, merging and discarding of items, which is convenient for players to manage their own items in the game.

2. Skill improvement: There are some skills in the game that need to be improved through continuous use, research and exploration. The skill bar in the built-in menu bar can display the skills that players have mastered and need to improve, which is convenient for players to upgrade their skills.

3. Production and synthesis: Production and synthesis in the game is an important part of survival. The production bar in the built-in menu bar can display the items that can be made and the materials needed, which is convenient for players to make and synthesize in the game.

4. Combat operation: There are many monsters and enemies in the game that need players to fight. The weapon bar in the built-in menu bar can display the weapons currently equipped by the player and the available attack methods, which is convenient for the player to fight.