automatically display a field depending on the value entered in another field

Summary:

Dear community,

Any one can share with me an example of rules that who controls the value displayed in a field depending on another field?

Content (required):

My business need is:

If the "type of contract" is the value "CDD-détaché"

then

Fill automaticaly in the "group type contract" field the value "Fixed Term Contract"

Many thanks for the help

Version (include the version you are using, if applicable):

22C

Code Snippet (add any code snippets that support your topic, if applicable):