I installed the latest version of Thunderbird on my two laptops. The first installation on my new laptop (Windows 10) the default display was the body of the email was displayed in the right column. I prefer this display. My second installation was on my old laptop (Windows 7) and that default display has the body of the email below the list of emails. I searched for almost 2 hours in the help section and cannot find how to change that display to email body to the right column with the email list to it's left. Sometimes it refers to options that are not available. I don't know why the same download would have different display setups defaults. I know this should be a simple thing but I'm frustrated trying to find it. Can anyone help me with this? Thank you.