• The UI is extremely oversized
• There's an ugly side scroll bar in the forecast graphics that takes up space it didn't need to
• Can't pin my favorite layers even if I hold the mouse button
• There's no longer a "Forecast for this location" button when viewing a favorite weather station
• The permanent huge crosshair in the middle of the screen

And possibly many other downsides if I kept searching, which I won't because I can't accept such a bad layout

Again, reverse this immediately and if you really want to use the layout, keep it as an optional mobile browser-only feature, though I don't think it's worth it because no one should be using the browser for windy, the app is way better and doesn't diverse development resources.