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You may not have the "Come to Work" expansion in your Sim 4.
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Going to buy that expansion for the restaurant.
If you want to open a restaurant at home, you must first install a "start-up" information film, and then "call" will have it and carry it out. >>>More
Since there are bugs where employees are lost, it's best to pack them all up in the world. >>>More
Looking at the bubbles on the head of the small person, it should be a shelter, so it is better to move the stove that is not done in the building mode to other parts of the restaurant and give it a try.
Not at this time, restaurant employees can only ask people outside the household.
The Sims 4 is a game that has the risk of losing employees because of its own mechanics, which is an internal bug of the game, so players have no way to hire additional employees.