Samsung Gear S3 SM-R760 - Manual (Page 41)

Basics
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Using handwriting input mode or the keyboard
Tap and open handwriting mode and write on the screen.
This feature may not be available depending on the region or service provider.
Changing the input mode
Rotate the bezel to change the input mode. You can switch between handwriting mode,
character mode, number mode, punctuation mode, emoticon mode, and voice input mode.
Changing the input language
Slide the space key left or right.
To add more languages, switch to number mode, punctuation mode, or emoticon mode.
Then, tap
→ Select input languages and select a language to add. You can use up to two
languages.