XFCE, external display stopped displaying, only laptop default one works

Laptop has external monitor connected to it via HDMI, at first it worked to display on both same content.
But now somehow external display is black. So how to reset display settings or fix this please?

btw. i have not yet understood why the Display configuration window sometimes show mirror displays x mirror screens what is what and how to handle that.

Please post the output of xrandr

output is here.

but i made it working with messing with Display config. winfow things and suddenly it started working, i do not know how. Maybe helped to reconnect the cable too or reordering displays by mouse drag & drop left to right. Enabling mirror.
Thank you for your previous comment.

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Iā€™m glad you got it working. I marked your post as the solution.