In patchwork of multiple ggplots, can’t set legend position

A simple patchwork of ggplot has left me uncertain how to locate the legend in the overall figure.

Only collect partial of legends with patchwork

I am trying to only “collect” partial of legends with patchwork, below is a minimal example.

how to let `patchwork` have equal width of columns when two rows have different number of columns?

below is a minimum example.