Thanks for reaching out with the details. I'd love to help you figure this out.
Go to the following location on Windows and set the scaling options in explorer to find out what works best for your setup.
C:\Program Files\Adobe\Adobe Lightroom Classic
Right-click on Lightroom.exe > Properties > Compatibility > Change Settings for all users > Change High DPI Settings > High DPI Scaling Override > Check the option 'Override High DPI scaling behavior.' > Scaling Performed by > Test & choose from the following options one by one > Application, System & System (Enhanced)
Apply each of these settings and test which works best for you.