Lost category of getting e-mails "today", "yesterday", "last week"

I am from germany. I’ve lost the blockwise category of getting e-mails “today”, “yesterday”, “last week” etc. How can I reactivate them? Didn’t find any possibility.
Thanks for helping.
Jens

Hello Jens,
check the settings in Tools>Settings>Mail>Read and down in the ‘Message list’ section see if the option to “Show messages in groups” is checked.

Regards,
Olivia