Hi Judy,
Thank you for bringing this to our attention. I understand your query if our Galaxy Watch 4 comes with fall detection. In line with this, it does come with a fall detection feature. You can get some peace of mind with your Samsung smartwatch.
Please visit its user manual on page 41 for further information;
https://downloadcenter.samsung.com/content/UM/202108/20210817054125174/WEA_R89X_R88X_R87X_R86X_EN_UM_071621_FINAL_AC.pdf
Also, you may visit this link below to use the detect fall feature on your smartwatch under "Turn on the Detect falls feature":
https://www.samsung.com/us/support/answer/ANS00087244/
Should you need more assistance, you may reach us via the following for immediate support:
1. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
2. Facebook Messenger: http://m.me/samsungsupport
3. Twitter: https://twitter.com/messages/compose?recepient_ id=18768513
Reference Number: 1144213771
Thank you for choosing Samsung. Have a great day!
^Chrystel