By default, the appearance of eesel is automatically in sync with your OS preference. You can override that to show eesel in dark or light mode independently of your OS configuration.
1. Go to your eesel settings
Open eesel in your new tab, and click the settings button:
Note that you might first have to click on your email or avatar to see the settings button if you're signed in.
2. Open the preferences
Click on the Preferences
tab:
3. Edit the Appearance option
Click on the dropdown under the Appearance
option and pick the configuration you want: