Reply To: Creating a broadside – How to make line widths equal, with multiple text sizes?

You might want to familiarize yourself with the default “1 point larger / 1 point smaller” hotkeys: Ctrl+Shift+<, Ctrl+Shift+> — “Cmd” instead of “Ctrl” on the Mac.

Also note that your example does not have all of its lines fully filled (and is this a historical example? it contains a typo: 'Achinng')

But to get you started here is a little Javascript, cobbled together in a few minutes. Select a text frame and run the script to make each paragraph fit on a single line. It works on each paragraph, separated by hard returns. It depends on the number of lines inside a paragraph, so it does not work at all with forced line breaks (Shift+Enter): no matter how small the type gets, the text would never 'fit' on a single line!