@jaWa ,
Quote from Microsoft:
On the ‘All' and ‘File' verticals, you can see the "File type" filter on the FileType property and the "Last modified" filter on the LastModifiedTime property
Per my test, "File type" filter displays well in organization search scope:
If we search in the site, only when we click on the "File" vertical search, the File type filter will be displayed as follows:
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