What’s in the menu bar on Mac?
The menu bar runs along the top of the screen on your Mac. Use the menus and icons in the menu bar to choose commands, perform tasks, and check status.
You can set an option to automatically hide the menu bar so it’s shown only when you move the pointer to the top of the screen. See Change Control Center settings.
Apple menu
The Apple menu 
App menus
App menus are located next to the Apple menu. The name of the app you’re using appears in bold, followed by other menus, often with standard names such as File, Edit, Format, or Window. Each app has a Help menu to make it easy to get information about using the app. See Use the built-in help.
Each menu contains commands, many of which are available in most apps. For example, the Open command is often in the File menu. For information about the symbols used in the keyboard shortcuts that are shown in the menu commands, see What are those symbols shown in menus?
Status menus
Toward the right end of the menu bar are items (sometimes called status menus), typically represented by icons, that let you check the status of your Mac (such as the battery charge) or customize features (such as keyboard brightness).
To show more details or options, click a status menu icon. For example, click the Wi-Fi icon 
to see a list of available networks or to quickly turn Wi-Fi on or off. You can choose which items to show in the menu bar.
To rearrange status menus, press and hold the Command key while you drag an icon. To quickly remove a status menu, press and hold the Command key while you drag the icon out of the menu bar.
Spotlight
If the Spotlight icon 
is shown in the menu bar, click the icon to search for items on your Mac and the web. See Search with Spotlight.
Control Center
Click the Control Center icon 
to open Control Center, where you can access features you use often, such as AirDrop, Stage Manager, Screen Mirroring, Focus, and more. See Use Control Center.
Privacy indicators, which can be dots or arrows, are located to the right of Control Center. An orange dot 
next to the Control Center icon in the menu bar indicates the microphone on your Mac is in use; a green dot 
indicates a camera is in use; a purple dot 
indicates the system audio is being recorded; and an arrow 
indicates your location is in use. Only one privacy indicator dot is shown at a time. For example, if both the microphone and a camera are in use, you only see a green dot. When you open Control Center, the top of the window may contain a field that shows which apps are using your microphone, location, camera, or system audio. You can click that field to open the Privacy window, which may have additional information (macOS 13.3 or later).
Notification Center
At the right end of the menu bar, click the date and time to open Notification Center, where you can view widgets and catch up on notifications you missed. See Use Notification Center.