Current Maintainers:
View Mode Selector creates a new field type called View Mode Selector which will override the view mode of an entity.
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Install the module the drupal way.
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Go to Manage fields and just select View mode selector as field type.
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Select view modes that should be provided.
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As form widget you can choose between a Select list, Radio buttons or Icons. Icons allows you to upload an icon for a view mode which will be used instead of the view mode label in the widget form.
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Create or edit an entity with the field attached and select a view mode.
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Every time an entity is rendered with the "view_mode_selector" view mode, View Mode Selector will change the view mode to the user selected one.
When the view mode of an entity did not change as expected a solution could be
to check which module are implementing the hook_entity_view_mode_alter, maybe another one overrides the view mode after View Mode Selector did it.