You can change this! Choose what the 'Enter' key does when you’re typing a chat message:
-Enter sends the message (this is the default), or
-Enter starts a new line in your Chat

Where to find this setting in Microsoft Teams
-Open Microsoft Teams
-Click the three dots (⋯) next to your profile picture or initials (top right)
-Select Settings
-Go to Chats and channels
-Look for “When writing a message, press Enter to…”

Choose:
-Send the message, or
-Start a new line 

Watch how to do this here: How to stop your Chats in Teams from sending when you press Enter.

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