Professionally in Unreal 5. Hate it with a passion. Not only is the engine a shared state leaking piece of s*it but the language(s) that come with it make the whole mess even worse.
In my free time I worked with Bevy which is really promising in my opinion. I hope their editor will be as amazing as the rest of the framework.
Recently I also tried Fyrox. It is nice, probably usable for some smaller things, but damn it feels a lot like Unreal again with going a OO-like paradigm. Of course little to no memory-safety issues it being developed in Rust as well (+ a runtime borrow checker they implemented on top to check on shared writes to Resources, Nodes, etc.), but compared to ECS it feels terribly clunky.