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Re:GTK File Chooser Dialog gets a thumbnail view after 18 years by nine_k on Saturday December 17, 2022 @10:34AM (#34028567)
And you can, of course, reassign that key.

Resizing takes grabbing an edge though.

Re:GTK File Chooser Dialog gets a thumbnail view after 18 years by tadfisher on Saturday December 17, 2022 @05:46PM (#34033070)
Alt+drag by default, but I remap it to super in dconf.