Had a look on
Decathlon at the spec of your bike, it's a great package. Good range of gears should suit most conditions and the rest of the bike looks just as well thought out.
Don't worry about rushing out to change the tyres. Try them and see how you get on, they will probably suit you just fine. You are no more likely to slip or fall off with narrower tyres unless you go faster, or tense up because you are worried.
Tyre pressure is a compromise between comfort and avoiding flats/rim damage. Lower pressures are more comfortable for a long ride but will also slightly increase the effort needed to ride at a given speed. This only really matters if you are racing, otherwise, just ride at the pressure/speed/effort you are happy with and enjoy the trip. I guess the fact you have bought an XS size bike means you don't weigh 90+kg so there is no need for you to ride on 90-100psi tyres.
I would suggest starting off at around 60-70psi and adjusting up or down from there depending on how it feels. Start with lower at the front than the rear, maybe 60psi Fr and 65-70psi Rr.
If and when you change tyres you could look at going up 1 or 2 sizes depending on frame clearance. Your existing tyres are 25mm, you might be able to fit 28mm or even 32mm. The larger tyres will give more comfort for the same or lower pressures and be less vulnerable to pinch punctures from hitting holes in the road.
Most importantly, enjoy your new bike. Ride it, get to know it, have fun
