Is your feature request related to a problem? Please describe.
The theme here is difficult to discover, at least for me. It took a week of use before I realized that the theme here could be changed.

Describe the solution you’d like
Make the change options more obvious; the white arrow in the red box is not easy to find.

Describe alternatives you’ve considered
A clear and concise description of any alternative solutions or features you’ve considered.

Additional context
screenshots：