Thank you for your question.
You are correct, on Android devices and the Mobile Web version, the "right-click to delete" function is not available due to platform limitations.
At the moment, there is unfortunately no built-in way to delete saved colors on mobile.
As a temporary workaround, you may try using a mouse via an adapter to access right-click functionality.
However, we understand that this is not a convenient solution for most users.
If this is something you would like to see improved, we can forward it as a Quality of Life (QOL) suggestion to the developer.
Feel free to let us know, and we’ll be happy to submit the feedback on your behalf.
Thank you for your understanding.