How to prevent locked screen turning off after a few second in GNOME?

Is there a way to keep it on for longer / set a custom delay? I changed it in screen lock settings but it doesn’t work. It always blanks immediately after lock and if I move the mouse and leave it, it turns blank again after something like 15 seconds.

These are the settings you want to adjust, what are they set to?

Thanks! I̶ ̶d̶i̶d̶n̶’̶t̶ ̶w̶o̶r̶k̶ ̶i̶n̶i̶t̶i̶a̶l̶l̶y̶ ̶f̶o̶r̶ ̶s̶o̶m̶e̶ ̶r̶e̶a̶s̶o̶n̶ ̶e̶v̶e̶n̶ ̶w̶h̶e̶n̶ ̶I̶ ̶s̶e̶t̶ ̶t̶h̶e̶ ̶S̶c̶r̶e̶e̶n̶ ̶B̶l̶a̶n̶k̶ ̶t̶o̶ ̶n̶e̶v̶e̶r̶.̶.̶.̶ ̶M̶a̶y̶b̶e̶ ̶t̶h̶e̶r̶e̶’̶s̶ ̶s̶o̶m̶e̶ ̶b̶u̶g̶ ̶w̶i̶t̶h̶ ̶e̶x̶t̶e̶r̶n̶a̶l̶ ̶m̶o̶n̶i̶t̶o̶r̶s̶.̶ ̶I̶t̶ ̶w̶o̶r̶k̶s̶,̶ ̶f̶o̶r̶ ̶n̶o̶w̶.̶h̶e̶l̶l̶o̶

P.S. Actually it doesn’t work. It still blanks quickly after lock. You can configure it with an extension(Unblank lock screen - GNOME Shell Extensions). But I was hoping to set it without third party apps/extension. Is there any way?