To switch between light and dark themes in Strategy Web and Library, follow these steps:
Administrator User Login:
Enter Appearance Editor:

Define Custom Colors:

MSTR Consumer User Login:
Change Application Theme:
Note: The default theme is also available as an option.

Strategy Web Limitations:
It's important to note that Strategy Web does not support the ability to switch between light and dark themes.
This feature is only available in Strategy Library.
For more information and related articles, please refer to the following resources:
https://www2.Strategy.com/producthelp/Current/Workstation/en-us/Content/modify_application_logo.htm
https://community.Strategy.com/s/article/Mobile-Configuration