Certain Redwood Features Not Showing in Appearance

Summary:

We have two Oracle environments with differing Setting > Appearance Redwood features available. For one environment we can select the theme (i.e. custom light, custom dark), whereas the other environment it doesn't show up. Does anyone have this issue and know how to enable themes?

Content (please ensure you mask any confidential information):

The images below show our two tenants for comparison. Both have Redwood enabled. We want to have both environments using the custom light themes.