I’ve had a slightly strange experience. I downloaded Essential Search on my Nothing (3a) Pro having updated to Nothing OS 4.0. The app worked to start with by giving me the yellow button next to the app drawer search bar. However, at one point it asked me to select a default search engine from Google and others. Now, I get the option to search with a range of apps, such as Google, Microsoft Edge, etc. but no option to use Essential Search.
Has anybody else had this experience? If so, have you been able to re-enable it?