If you login to EO Browser with your username, you should be able to access your configurations by selecting “Themes” at the left bottom part, under the rest of the data sources.
That being said, I am not 100% sure it works for non-Sentinel data sources as it was designed prior to multi-system functionality of Sentinel Hub. Give it a try.
Sorry about that. We just noticed we have introduced a bug, which prevents this. We are working to fix it and should be available soon. Will let you know, once this is the case.