In earlier models we had option to sync selective items like only Gmail and not Contacts of an account being added to phone, but now If I add 2nd account, by default it syncs all data(gmail, contacts etc while adding itself).And there is no option to remove the synced contacts of one account. Please help in this regards. In Mi10i the manufacturer had made the OS in such a way, from whichever app I add a google account it just launches same "account adding screen(may be from play services)" and no option but to agree for play services to use this signin in all google apps.
As AndrewT mentioned, you can select the items that you want to sync. To prevent sync when adding the account for the first time, you can turn off the sync toggle in quick settings before adding the account.