Layout suggestion for Thunderbird (Mac)

[JoeNS]

Hi team,

may I suggest that there should be a thicker line between Message List Header and Message Pane, so user can 

A five pixel invisible one is a hard to catch sometimes, and on some occasions it isn't there (a bug maybe?) and Thunderbird restart helps.

I have 147.0 (aarch64) installed on 26.2

Regards,

Jovan

[Jon]

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