There got a lot of tiling window manager for macOS. People create another and another and another new ones.
Apple does some things best in class but the core design of windowing & using applications is just awful imo.
Turn off `When switching to an application, switch to a Space with open windows for the application` and then you'll be able to create a new Safari window in the current Space, not the 'existing Safari space'.
The specific path is for Tahoe, but the setting itself has been there for a long time, I think.