You can enable dark theme in configurable workspaces only, and not for classic environment.
Before you begin
Some properties in the system aren’t visible in an instance by default and must be added to the System Property [sys_properties] table. For information on adding a system property see Add a system property
Role required: admin
Procedure
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Navigate to All in the app navigator and search for
sys_properties.list.
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In the list search bar, search for
glide.ui.polaris.dark_themes_enabled.
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Set
glide.ui.polaris.dark_themes_enabled to True to enable the dark theme in all of Next Experience.
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In the list search bar, search for
glide.ui.polaris.core_ui_exclude_dark_mode.
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Set
glide.ui.polaris.core_ui_exclude_dark_mode to True to exclude the dark theme in classic environment.
Note: If you select the dark theme, the dark theme only applies to configurable workspaces. Classic environment remain in the default theme.