This is one of the options when right clicking a tab. I often use the option “Close tabs to the right”, usually when I’m done researching a topic that I created a bunch of new tabs for. But sometimes I accidentally click “Bring all tabs to this window” because it’s located where “Close tabs to the right” used to be (last item in a subgroup near the bottom).
I keep multiple windows open with multiple tabs due to the nature of my work and accidentally clicking this options is very annoying. I don’t know who asked for this feature, but it’s very disruptive and creates a lot of needless frustration for me and others like me who keep multiple windows and tabs open.
I strongly recommend either removing this option from the menu, providing a way to disable it, or at least some kind of “Are you sure?” prompt. I like Brave and would like to keep using it, but the presence of this option is becoming a deal breaker.