On the android I installed Thunderbird. when I go into the inbox, 1/3 screen shows email list.. 2/3 shows a message preview. I want to remove that preview. I only want to see my emails. I will click on an email if I want to read dit... IT would be fine if I could adjust the preview size but its set at 2/3 to 3/4 of my screen. leaving a tiny column for the emails. Either adjust preview size, or remove it totally? Please advise