There are several ways to do it.
Option 1: (The easy way)
In the tag browser, right-click the "Fiction.Horror" tag and choose "Rename Horror". Change it to "F.Horror" and hit Enter.
Option 2:
In the tag browser, select the "Fiction.Horror" tag. This should filter the books so only the books with that tag show.
Select all in the library.
Edit Metadata -> Edit Metadata in Bulk.
In "Add Tags" type "F.Horror". In "Remove Tags" type "Fiction.Horror". Hit OK.
Option 3:
Select the "Fiction.Horror" books as above, and Edit Metadata in Bulk. In the Search and Replace tab, enter the following values:
Search Field: tags
Search for: Fiction.Horror
Replace with: F.Horror
Hit OK.
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