Is possible to make a Win32 FMX app works similar to a mobile application?

Is possible to make a Win32 FMX app works similar to a mobile application? When I click to show a new form (Form2.Show, ie.) it will of course open a new window, floating away the main (1st form).
Using Parent don't works (Form2.Parent := Form1; ... )
I read this answer from Brian but was unable to figure out how to make it work, using the same example of the OP did not make the magic :), here: https://community.embarcadero.com/answers/q-best-practices-for-opening-closing-fmx-form

https://community.embarcadero.com/answers/q-best-practices-for-opening-closing-fmx-form