I also request the current lens size to be increased to 20 please. I use Google's programmable search engine to search through current websites till now - https://nikkin.dev/custom-search.html
I started with the professional plan and soon realised that only 10 domains are allowed. And something like 20 sites in a lens would help me ditch Google's custom search engine.
Also, the UI for creating custom lenses could be better. It would be nice to have the text input for sites as <textarea> so that when editing the lens, it is clear which sites are present. Thanks!