PROBLEM STATEMENT
AIDA64 upscales the SensorPanel based on the scale of the main monitor, 150%.
AIDA64 changes the SensorPanel's resolution Preference from 1280x800 to 1920x1200.
AIDA64 displays the SensorPanel on the primary display even though the SensorPanel was moved to the 2ndary display an locked there.
After modifying the SensorPanel size Preference back to 1280x800, AIDA64 continues to upscale the SensorPanel even though the same .sensorpanel file is imported
FOUND A SOLUTION
Here's the steps I followed.
Change the main display Scale to 100%. (This step may not be necessary, but I did it anyway to rule out any issue with application scale.)
Go to this folder: C:\Program Files (x86)\FinalWire\AIDA64 Extreme\
Right-click on AIDA64.EXE and select Properties.
Select the Compatibility tab.
Select "Change high DPI settings"
Select the bottom option and change it to: "Override high