I have not been able to confirm this - but it SEEMS that Hi-DPI support is geared toward adjusting the screen output of my Laz app to the DPI of the user's monitor.
My desire is to increase the size of the components for users with poor eyesight. One user with a 1920 x 1200 res monitor maybe happy with the size of the components in my app, while another user with the same monitor res, but with poorer eyesight, may want to have all the items enlarged. Thus I want to let the user choose the degree of enlargement.
Yes, I have Use LCL scaling checked as well as "use manifest support". Without using AutoAdjustLayout the size of components/items is unchanged.