i couldnt figure out how to. i know you can right click the url of a website to add as a search engine, but this only works if the website supports it, and many dont. you can also import/export search engines from a file
Hm, I thought I saw it in the desktop app, too, but apparently it’s managed differently over there. You click on “find more search engines” which leads to the add-on store (version 119). On mobile it’s different.