I tought it can be done but when you go into the analysis board, going into the board editor then go back into the analysis board but that doesn't work. When you do that it sets the game back to standard and when you try to select Chess950 it resets everything back to standard positions.

Maybe when a person selects Chess950 in the analysis board it should go straight into the board editor to allow the person to set the board how they want.

All this said and done, isn't the purpose of Chess960 to have random starting positions, making an opening explore of it sort of a moot point?

to set a custom starting position in chess960: paste FEN

ideally a UI shortcut should be implemented to take a start position ID

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It is an old question that remains pending

Oh this existed already i should have checked :/