SUMMARY
Once the scale button is clicked the screen goes blank.

STEPS TO REPRODUCE
1. Connect to a host, set a window size and click scale
2. 
3. 

OBSERVED RESULT
blank screen

EXPECTED RESULT
Visible scaling of host to fit viewing window

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 24.04
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.8.0-35-generic (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 5800X 8-Core Processor
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7C35
System Version: 2.0

ADDITIONAL INFORMATION
here is fix I found that does fix the problem that needs to be reflected and incorporated in the program:
https://www.shernet.com/linux/fixing-krdc-vnc-scaling/