Change the dark theme to a slightly lighter colour

Frequently Asked Questions
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You can also try user created dark themes.

https://www.emclient.com/themes

Or alt design or modify your own dark theme.

https://www.emclient.com/blog/design-your-own-em-client-421

Open the “Theme Editor” and customise any theme via “Menu / Tools / Theme Editor"

Note:- Remember If you use the Theme Editor to modify any current theme, “Save the Theme” first in eM Client Themes via “Menu / Settings / Appeance / Themes” with a different name, by clicking the “Advanced” button at the bottom right.

Then “Open and Modify” that theme in the eM Client Theme editor. The default Theme save directory for eg: Windows 10 / 11 is normally eg: - C:\Users\yourname\AppData\Roaming\eM Client

Also thread on creating custom themes in eM Client Custom eM Client Themes