Mazda 2020 CX30 S model

I just got 2020 Mazda cx30 s 2 litre model last month. It’s a pretty nice car I like it very much. it’s a normal 2 litre sky active engine

My question is, I put 91 octane fuel instead of 95, is that make any problem to the car

How can go back to 95 octane ?

Do I need to go back to 95 octane ?

Please help me