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Hello @Klavier and a very warm welcome to our community! The game does show you what the objective is so that should help a little bit, but I don't think they will let you see a thumbnail of the whole board. Once upon a time they let you open the level and then exit without penalty - but that changed quite awhile ago.
I will let this stay open for now.
This feature used to be done in the flash version of the game and was helpful, because it'd let us know whether or not to use starting boosters.
There has been several cases in the past where I started a level with starting boosters, win streak would also add its booster rewards and upon start of the level, the game suddenly finds that there are no valid switches available and cannot shuffle any.
LEVEL FAILED and crown lost all because I didn't know what the level layout was like and whether boosters could risk making no moves possible.