Hi Emerald1,
Thank you for reaching out to us. We value your query regarding if you can change the watch face on the Galaxy Watch4. In line with this, yes, you can adjust the watch face on your watch.
For more information, kindly visit the user's manual about "Change the Watch Face" on page 19: https://downloadcenter.samsung.com/content/UM/202109/20210929010214001/WEA_R89X_R88X_R87X_R86X_EN_UM_071621_FINAL_AC.pdf
Also, here's another link to "Manage Watch Faces for your Samsung Smart watch": https://www.samsung.com/us/support/answer/ANS00080308/.
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: 1144348183
Thank you for choosing Samsung. Have a great day!
^Chrystel