The Tyk Enterprise Developer Portal enables user to have multiple themes at the same time but I do not find a button or any way to delete the unused theme.
And when I upload a new theme use same name with existing one, the existing one has not been replaced entirely. For example, the existing one is 4.2M, I upload a new one 2.1M, then I download if from portal, it is 4.2M, why the existing one has not been replaced entirely??
@Tianyi_Wang Hello and welcome to the community 
You can follow our how to guide on how to delete enterprise portal themes
I think I have stumbled on this too. I believe the portal does some sort of comparison and appends/adds what is missing. It doesn’t work like a classic replace. I believe you can delete the theme first then upload it’s replacement
Let us know if this helps.