Apple must have realized that it ticked off Watch owners by making the new face changing process so clumsy. That’s why it fixed the issue with the latest 10.2 update. For this, open the Watch app on your iPhone, head to General, select Software Update, and then install the latest version.
Altefnatively, you can update the OS directly from your watch. For that, open the Settings app on the watch, tap General and then Software Updates, and allow the new version to be installed.