Cannot edit the length of last bar in a line anymore?

When you touch the top of a measure line, it shows a small square allowing you to resize that measure left-right (and also move the whole line up or down).

I used to be able to get that square to show up at the end of measures, and I would have one small measure in a line with blank space to the right of it. I can no longer get the editing square to show up on the ending lines of measures??

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