Mosaic is an i3-style auto-tiling extension for GNOME Shell

Mosaic brings i3-style automatic tiling to GNOME Shell without asking you to choose it permanently. Turn it on when you want windows to arrange themselves, turn it off when you want floating windows back. The extension works with GNOME 45 and up, adding a toggle is to Quick Settings to enable the auto-tiling mode. When off, you’re in floating mode (which still has tiling features). Expand the toggle to access more options or get at Mosaic’s settings. It’s the on-demand nature makes Mosaic more interesting. When the auto-tiling mode is active (the toggle is turned on) all your windows tile […]
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https://www.omgubuntu.co.uk/2026/07/mosaic-automatic-window-tiling-gnome-shell