I have a 49 inch CRG9 and the best recommendation for window management is Yabai (https://github.com/koekeishiya/yabai) along with skhd (https://github.com/koekeishiya/skhd). Yabai is a greedy window management solution that tries to fit opened applications in given space and skhd let's you easily jump between those using keyboard shortcuts. This has massively improved my ultrawide experience.

Only disclaimer is, configuring yabai has a slight learning curve.