I am having the reverse problem (too small ui). XFCE 4.14 with Appearance -> Settings -> Window Scaling 2x. I tried QT_AUTO_SCREEN_SCALE_FACTOR several different ways, but no luck in getting it to resize. It's still usable, just a little difficult to read.
I just wanted to report that the application doesn't render well on HiDPI screen, here is a screenshot!
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