Change Language & Region General preferences on Mac
On your Mac, use the General pane of Language & Region System Preferences to select the languages shown in the Finder and in apps, and choose the formats used to show dates, times, numbers, and currency.
To open this pane, choose Apple menu > System Preferences, click Language & Region, then click General.
The languages you want shown in macOS and in apps (for example, in menus and messages), and on websites (if available in a preferred language).
If macOS or an app supports the primary language, that language is used. If not, the other languages are used, in the order listed. You can drag languages in the list to reorder them. See Change the language your Mac uses and If non-Latin fonts don’t appear correctly on Mac.
If you add input sources, those languages are automatically added to the list.
Add , Remove
Add and remove languages from the list.
The geographic region whose formats are used for dates, times, numbers, and currencies.
When you choose a different region, the options and the preview shown change.
First day of week
The day on which a calendar week starts. This value is used in apps such as Calendar.
The type of calendar used to display dates and times.
Use a 24-hour format for the time shown in the menu bar. For example, instead of 3:00 PM, show 15:00.
This option overrides the clock setting in Date & Time preferences.
The preferred temperature format.
The characters used to display numbers.
This option is available only for some primary languages, such as some Arabic or Indian languages.
List sort order
The order used to sort items by name in the Finder.
This option appears only if you add a language or input source that offers a sort order other than Universal.
Open the Input Sources pane of Keyboard preferences, where you can add and remove input sources, and set options for input sources.