On Windows: I hate it too.

Takes up more space without any benefit. this version looks "modern" but from a usability standpoint, it is worse.

Hope Prusa goes in and makes the toolbar (Menu, Platter, Print Settings, filament, Printers, physical printer) small/less height and gives the buttons something to make them look like a button. Right now it is just text on a grey background. Big steps in the wrong direction in my opinion as it stands but easy to fix.

The addition of the physical printer page/tab is nice. Now I can view the Duet web interface directly in prusaslicer. While the printer are 99% upload and forget from time to time I need to view the control panel to check or adjust a thing or two.

On pc there is a setting to revert to old menu bar appearance.

There is some good stuff in this release. Go to Preferences > GUI and check "Show sidebar collapse/expand button" + "Settings in non-modal window". Now you can put the Preview and Print Settings windows side-by-side, and see the result of every change immediately. This also requires "Background processing", but that's been available for ages.

I like the new design more but agree the menu height should be smaller or adjustable.

And on Linux it looks even less native now

Does Apple lack a feature to turn off or hide the file menu?

I don't recall if I custom bound mine or if GNOME defaults to, but I never see those old things unless I press F10.

I agree that it is not very pretty having all three of those bars in growing redundant nonsense. Tiling frames are like desktop icons IMO; very retirement-center historical-preservation aesthetic design, but we're talking about desktop environments at that point, not the app dev. Apple wants things to be their little aesthetic way to monopolize, so they intentionally make decisions that erode the usefulness of outside package standards.

Honestly I'd just stick to orca slicer