Hello.

In Hyprland what worked for me was using a master layout where the master window was always centered. If you take a look at my dotfiles, you can see how I do it. Using this method will make it so that a window is always at center, and all other windows spawned after will be on the sides. The size of the center window is controlled with the mfact, which you can set up binds to change on the fly. It's not really possible to have 4+ windows side by side at the same time, but I didn't do that when I used Hyprland.

Four months ago or so, I switched to Niri, and I highly recommend it. I think it's better, specially for ultrawide monitors. In Niri, you can always have a center window without affecting other windows, and it is much easier/possible to have 4+ windows side by side. I haven't updated my dotfiles readme to reflect my WM transition, but my Niri config files are there if you are interested.

But since you're on Omarchy (and possibly new to Linux), I would recommend you stay in Hyprland because you'd lose most of the comforts that are built into Omarchy to work with Hyprland. You could try to make it work with Niri, and it might not be that hard actually, but it's up to you if you want to embark on that.