Why does my group stack when it has space?

[SerPounce]

Thanks again Petter.

Actually, by sheer wonderful coincidence, I found the answer and complete explanation in this parallel thread via the solution posted by @fayewatson.

Margins around centered element in header not squeezed

New to Bubble. Need help with Responsiveness. I have a button centered in my header but the margins around the button are not being squeezed. This is forcing elements into multiple lines prematurely. Here’s a link to the issue in a test environment: Header Test