Created attachment 187571 [details]
screenshots of the different scaling settings (no scaling, minimum scaling, maximum scaling)

SUMMARY
when using KRDC on a high-density display and connecting to a VNC host with low-density displays, the remote desktop ends up quite small and cannot be scaled up enough to become legible.

STEPS TO REPRODUCE
1. run KRDC on a system with a high-density display
2. connect over VNC to a host with low-density displays

OBSERVED RESULT
regardless of KRDC scaling settings, the remote desktop ends up small and difficult to read.

EXPECTED RESULT
ideally there would be a way to scale up the remote desktop for better legibility.

SOFTWARE/OS VERSIONS
Operating System: NixOS 25.11
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
i am using a high-denstiy 2880x1800 display at 150% scaling. my VNC host has three low-density displays side by side (1920x1080, 1920x1080 and 1200x1600) at 100% scaling.

it seems that when scaling is disabled in KRDC, pixels are mapped 1 to 1. this results in very small text which i struggle to read.

with scaling enabled and the scale factor slider at minimum, KRDC scales the remote desktop to fit the window. given the very wide nature of my remote display configuration, this of course makes everything even smaller.

increasing the scale factor seems like the obvious fix, but the slider tops out somewhere just below 1x. perhaps the range could be extended upwards, to 2x (or more)?