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You can click "Archive":
it would be good to fill in the reason field archive style and update the notes / description.
(Bad practice) You can change name style, remove almost the whole code (leave enough to save succeed), save and click archive.
if opened Manage All Styles you can click "delete" button above style to delete
if opened Installed style (and have active opened tab for this style) you can click bin / trash icon to delete style
from pop-up you can click "Manage" or icon bin / trash from style to delete (pop-up show only style for match active opened tab)
if you click "Manage" you can delete Style to click in "X" to the right of the style name