I've created a flex grid and made it how I like it. It's great on a PC. So it works OK on a phone, I've made a breakpoint at 800px and adjusted the flex grid accordingly. That all works fine down to about 400px. The, I get increasingly large blank spaces between a menu and text.
Here's what it looks like at 600px approx.

When I reduce the size, this is what happens:

And here's a cut down version of my WWB file (no images) so you can see what I've done. Any advice gratefully received.
https://www.dropbox.com/scl/fi/cz3kp3kf ... ggofh&dl=1
Thanks
Alan