Step 1: First Log in to the Admin area of your website and navigate to the Addons section in the sidebar and select Wgs Adminx (Addons -> Wgs Adminx), as shown in the screenshot below. 
Step 2: Once you are on the AdminX Addon Dashboard, click on the Menu button located at the top and select Settings (Menu button -> Settings), as shown in the screenshot.
Step 3: In the Settings page, locate the Style Settings section and click the button, and from the available options, select Color Scheme 11 (which corresponds to the dark theme), then click Save.
After following these steps, the AdminX interface will switch to the Dark color scheme.
