
There you find options to make the subject larger, make Thunderbird display the full email address all the time, show the sender's profile picture, if available, and to hide the label column. Select the More button when viewing a message and then Customize to display the options. You may switch between normal and full headers, but the real beauty comes in form of a settings dialog that gives you more control over headers.

Message headers have received a serious makeover in the new Thunderbird release. In fact, you may hide the Spaces toolbar and still use the shortcuts to launch the tools. Keyboard users may use Alt-1 to Alt-5 to launch these directly without moving the mouse or the finger near the bar. It offers quick jumps to core tools, such as the address book or tasks. The Spaces toolbar, located on the left side of the email client, is one of these changes. When you launch Thunderbird 102 for the first time, you will notice some of these changes immediately.

Select Tools > Addons and Themes to do so.

You may want to switch to another theme to see if it resolves these. Tip: if you notice display issues, these may be caused by the selected theme. The client has a new look, with fresh icons, colored folders and several other layout and design improvements. It moves the email client to a new foundation. You may want to check out our review of the Thunderbird 102 beta features here, but expect a new look, new address book, improved account setup and migration, link preview cards support, support for multiple spell checking dictionaries, and a redesigned message header among other new features.
