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Hi Ina_Karolina, thank you for your feedback and sorry to hear that you are facing these issues.
Can you confirm what device are you using? Is it Mi A2 or Mi A2 Lite?
Please be informed that your device should not be rolled back to Android O or previous versions once it got updated to Android P.
Since Android P has brought many irreversible updates to the system, rolling back to previous versions may cause errors and defects, which can have an effect on the normal functioning of your device. Please note this and thanks for your understanding.
I'm aware that the dev team is collecting feedback in these last days and already working on a solution for those facing these issues. It might be worth to wait a little bit for further updates.
Overall, the new icons design come from the new launcher integrated into Android Pie and can't be modified as Mi A2 and Mi A2 Lite are Android One devices, therefore using Android Stock. What you can do is installing an alternative launcher that allows you to customise your home interface and therefore supports third-party icons.