Junk emails

See the article and exact check marks should be done , click on reset icon Change Junk Mail settings in Mail on Mac - Apple Support

Restore the default criteria for identifying junk mail. 

Use this option only if Mail no longer handles junk mail as you expect. Resetting the filter deletes everything that Mail has learned from you about junk mail.

See this article If junk mail filters aren’t working in Mail on Mac - Apple Support

You have to follow the steps to filter junk mails Manage junk mail in Mail on iCloud.com - Apple Support

Set up rules to filter email in Mail on iCloud.com

Apple Support article: Report and block spam in iCloud mail

Perhaps the following would be a more effective set of settings. Notably, when the filtering is working, filtered junk mail should be automatically moved into your Junk folder. Ah, don't be surprised if you suddenly start to see a lot of unread messages flowing into Junk.

MD1029 Said:

"Junk emails: I get a hundred spam emails a day!!! How do I stop this???"

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Avoiding Spam:

Enable Restrictions (on the eMail Provider's Site):

Logging into your eMail provider's site, see if you have the option to only allow eMails for Contacts. As an example, go here for gmail: Allow eMails only with Authorized Addresses or Domains - Apple Support. You might not get certain eMails, so add them to your Contacts list, and add domains to a Safe List.

Then mark mails as read Mark emails as read or unread in Mail on Mac - Apple Support if the mails are junk they will follow the rule what it is being applied .