Toolbar trivia

I'm running Thunderbird 140.0 on Windows 11. I love the things that extensions can do and so have a lot of them (I do worry about conflicts, but that seems to be less of a problem now). One problem I see is that the space allotted for the toolbar is too limited. It would be helpful if I could reduce slightly the space between the buttons. I like the icon above description arrangement, but there are a couple with very long descriptions that are shown all on one line, making the button take up a lot of space. Another thing that I've wondered about is the possibility of having another toolbar to contain the buttons that won't fit into the standard space.