@techee plug in a bigger screen, or better get a theme that doesn't include so much padding. Or both 😀
Or none of these and use my normal solution "don't use Windows" :-) Testing Geany was just a good opportunity to install one and half years worth of updates...
Seriously though, compared to my MS Surface tablet (no it doesn't have Geany) it does look quite expanded. The tablet (in landscape) fits many more lines than that, what font size are you using?
The "recommended" scale for the (HiDPI) screen is set to 300% and yes, everything is quite big. But when changed to 250%, everything gets really small so I don't know how it's calculated.
Edit: or is the dell a reeeeely small screen?
It's an older model with 16:9 screen, the newer ones have 16:10 so I think that would be just enough to fit the preferences dialog there.
Anyway, back to "not using Windows" again...