[addon-themes]: a one click change for two themes

[boar-is]

Is your feature request related to a problem? Please describe.

Most of my projects only have light and dark themes. I get frustrated every time I want to change a theme because I have to open the dropdown first.

Describe the solution you'd like

If there are only two themes, don't open the dropdown but just switch the theme immediately.

Describe alternatives you've considered

No response

Are you able to assist to bring the feature to reality?

no

Additional context

No response