I want to show the totals of € in my modern SP-lists.
But I do not know how to do it. Can someone help?
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Showing Total feature on Modern UI is still not available. Though it is under development as per this link. They started rolling out for some tenants and seems rolled back again due to some issue.
Reference links having same issues
You would have to wait till this feature is available, or as alternative use below:
Create Modern Page
Add List view to it with totals enabled.