In the main page right side , users are not allowed to minimize the window to 3/4 lines of email and let more space to the bottom preview with the mouse now I can move up the line a lot less than previous TB versions ( only approx 50% of the screen ) On my 16/9 LapTop the selected message shows minimal (upper) preview of the message due a lack of space I see no reason for that block , as basic user Got this problem since the last important facelift months ago Hope you can restore previous customizable number of 3/4 emails to enhance preview . I run Win11 - Thunderbird 115.03.1 Thanks in advance Regards / Stefano