R flips the board? Very unintuitive. In chessbase it's ctrl + f. On lichess it's f.
R rotates the board, it seems to be somewhat arbitrary which character achieves what you want once you know which key to use. When we added a key binding for flipping, we'd already been using 'f' for something else, so 'f' wasn't available.
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I want the board to be in the center. Why do I need to look to the left? The board is too small. I want it as big as possible but still be able to see the opening book and the scoresheet.
The larger the board , the less move list, opening explorer and game search results you get so there are tradeoffs in having a larger board. If you're happy with those tradeoffs the board is resizable using the resize handle on the right edge of the board. We've chosen a default we believe offers a compromise between a reasonable sized board, and still providing enough screen left for the other UI elements, while still leaving you with the option to choose your own board size.
In any case, I don't think any of this relates to 'ugly' as it is functionality issues you are describing, not form, and it sounds like there are reasonable workarounds for the functionality issues you've described (3 different ways of rotating the board, and a resizable board). I'm sorry you're not happy with the new UI. Given you were one of our first users, I'm sure you've gotten very used to the old DB UI, but hopefully you'll find the new UI less objectionable over time. We may offer some options for more control over UI layout in the future where the move list could be optionally shown on the left, but this is probably not going to be a short term priority at the moment.