@leocg Ah, that's unfortunate then. That kind of kills my desire to use the browser, and I'm sure I'm not the only one. Not trying to be a "waaah cater to me" kind of person here, but that's a feature set it may be worth considering if not already on a docket. Thank you for the answer regardless, and I hope you have a lovely day.

I am trying to both:
a) delete some of the default search engines I never want to use even by accident,
and b) change my default search engine to a custom input.

Regarding A, I simply don't see an option to delete them anywhere, but I'm sure it must be doable somehow?

Regarding B:
I've added a custom search engine for Ecosia (my preferred search), as seen below.

However, when I go to try and change the default browser to Ecosia, it only give the options of the default ones (including, as mentioned, ones I would like to delete)

How do I set it to the custom search engine? (I've also tried installing the Ecosia extension like I used on FF/Chrome, but it seems to be having no effect..)