Hi,
I've a Win10-Notebook where the internal monitor works with 125% of standard DPI (96+25% = 120) whereas the external monitor is set to 96 DPI. With internal monitor closed applications start on the external one, also the Setups build by SetupBuilder. So far so good. But the setup-dialogs are displayed with 120 DPI, so the do not consider the DPI of the monitor they are started on, but seems they are taking the DPI of the primary internal screen.
best regards
Toni Santa