The France national team need to make use of the pitch not playing a one sided game if not they'll pay for it, Mbappe shouldn't be the only target and Dembele shouldn't waste more chances in this encounter and if that happens the Spanish players will capitalize on them and it will be more dangerous if Spain takes the lead but one thing is sure, a draw can happen if the France side keep it calm, IMO France they can't beat Spain even if it goes on to extra time.
I think Spain will beat France... By the way bookmakers give equally high odds for a win for one of the teams or a draw, now it's about 3.0... But in previous play-off matches the game often went into extra time, so it can happen here too... But I'll probably take my chances and bet on Spain's win...
France performance haven't met fans expectations, compared to their performance during the last World Cup. They have continously struggled to win matches. Few players have been performing good e.g kante, saliba and tchuameni. Kylian Mbape being their key man have been struggling to put out good performance to his name, France are really lacking a play maker and someone who can control the midfield and give finishing passes for goals.
It will be a tight game since both countries are top European teams and with good players in both teams. But Spain will go into this game with a higher percentage to win France.