I assume your "proportional" mean "aspect ratio".
I'm afraid settings for aspect ratio is not available in Tableau Desktop.
For example, with dashboard range setting in your sample workbook,
width changes from 1200 to 2400
height changes from 600 to 1200
But there's no proportional limitation on them.
Both on dashboard level and container level, there's no ratio setting for auto size.
The workbook that I attached with the original post behaves as I want it to. When I put the sheets in the layout containers, they don’t maintain the aspect ratio. Why does it work with empty containers but not with sheets inserted? I will not pursue this further but it just seems like if I can get the empty containers to do what I want, they should do the same when they are filled.
My advice is to replace the blank containers with worksheets,
instead of putting the worksheets into the containers.
In the attached sample, the worksheets behavior similar to the previous blank containers.
Layout Containers.twbx 23.6 KB
No they don't, because Sheet 2 grows when you stretch the screen but Sheet 5 does not. I want Sheet 2 and Sheet 5 to be the same proportion - I want each sheet to take up exactly half of its container. The four sheets at the right side behave properly.
I am giving up on the idea of an adjustable layout for now. Thanks so much for your help.