Themes is a part of the Home Assistant
Themes is not enabled by default in HACS (this follows default Home Assistant behavior)..
Enable themes in HACS
There are 2 ways of doing this.
Enable if you used the UI to configure HACS
Add a checkmark to the left of themes in the UI configuration for HACS.
Enable if you used YAML to configure HACS
If you used YAML to configure HACS, add this under your HACS configuration to enable themes:
After adding that you need to restart Home Assistant.
Enable themes in Home Assistant
Add this to your
frontend:themes: !include_dir_merge_named themes
Themes download location
Any theme downloaded with HACS is stored in
themes/ in your Home Assistant configuration directory.