@Tassen-CasanovaWhen you start the game before you enter your household you are already in this panel. The city map is the place where you choose or enter your household or start building something on empty lots.
You can also enter this panel from your family.also. This option is in the upper right corner of the screen. There you will find Manage worlds.
It is not enough to put a restaurant in town to run it.
To have a restaurant you must buy this restaurant The option to buy restaurants is on your sim bar. (Where needs, statistics, and the like are.) After the building is erected in the city, this building belongs to the city - not to you.