Switcher dark mode is off by default.
So, you should turn it on at Admin Dashboard > Appearance > Customize > Colors > Allow User's site skin
And then, you can see the switcher in Frontend > Dashboard > Settings > Preferences
The LiteSpeed Cache for WordPress plugin is an all-in-one site acceleration plugin, featuring an exclusive server-level cache and a collection of optimization features. It helps enhance WordPress site performance by taking advantage of the LiteSpeed wen server's built-in page cache, resulting in faster page load time for visitors.
After activated successfully the LiteSpeed Cache plugin, you can follow our instructions to optimize your site's speed.
Note: If the option Load JS Deferred is ON, you need to add 2 more rows into JS Deferred Excludes box like the below screenshot:
If you make any other changes to the settings, click Save Changes to save the new configuration.