13 classes are annotated with ViewsStyle in Drupal 9

DefaultStyle in core/modules/views/src/Plugin/views/style/DefaultStyle.php

Unformatted style plugin to render rows one after another with no decorations.

DefaultSummary in core/modules/views/src/Plugin/views/style/DefaultSummary.php

The default style plugin for summaries.

EntityReference in core/modules/views/src/Plugin/views/style/EntityReference.php

EntityReference style plugin.

Grid in core/modules/views/src/Plugin/views/style/Grid.php

Style plugin to render each item in a grid cell.

HtmlList in core/modules/views/src/Plugin/views/style/HtmlList.php

Style plugin to render each item in an ordered or unordered list.

MappingTest in core/modules/views/tests/modules/views_test_data/src/Plugin/views/style/MappingTest.php

Provides a test plugin for the mapping style.

Opml in core/modules/views/src/Plugin/views/style/Opml.php

Default style plugin to render an OPML feed.

Rss in core/modules/views/src/Plugin/views/style/Rss.php

Default style plugin to render an RSS feed.

Serializer in core/modules/rest/src/Plugin/views/style/Serializer.php

The style plugin for serialized output formats.

StyleTemplateTest in core/modules/views/tests/modules/views_test_data/src/Plugin/views/style/StyleTemplateTest.php

Provides a general test style template plugin.

StyleTest in core/modules/views/tests/modules/views_test_data/src/Plugin/views/style/StyleTest.php

Provides a general test style plugin.

Table in core/modules/views/src/Plugin/views/style/Table.php

Style plugin to render each item as a row in a table.

UnformattedSummary in core/modules/views/src/Plugin/views/style/UnformattedSummary.php

The default style plugin for summaries.