I have difficulty using precise mouse movements. Microsoft helps me by allowing me to increase the width of the scroll bar on windows. However they can’t help me with internal scroll bars within eM Client.
Here’s an example of the wide scroll bar and the very narrow scroll bar within eM Client:
You can either “use a different default Theme” which already has wider scroll bars, Or “customise a Theme” to have wider scrollbars if you don’t like any of the default Themes with the built-in Themes editor, Or use one of the user created Themes with wider scrollbars, Or you can just set the option to enable wider scrollbars with any default built-in Theme in Settings as per the below example.
If you have eM Client V10, you can enable wider scrollbars by going to “Menu / Settings (Preferences) / Appearance / Lists” and click the dropdown on the right of “Scrollbar Style” and select Use wide scrollbars.