How to undigitize a collection/ make the game require a disc

Recently I've been trying to convert my (mostly digital) game collection to a physical one, but I noticed an oddity when I go to install. My process is to uninstall the digital version, and install with a disc version so that the disc is needed for future playing. But sometimes it'll still allow me to play without the disc and I'm wondering;

Why is this?

Is there some way I can make it so it requires the disc?

For an example I first bought Star Wars Knights of the old republic, and Star Wars republic commando digitally. But after doing my process. Old republic needs the disc, but commando doesn't

:)