You chose the LXDE desktop environment option. This installs
task-lxde-desktop, which pulls in, among other things, packages
xorg, including a browser and office suite as part of a typical desktop load.
If you want a minimal installation, don't select additional packages to install at this point. As it says on that page of the installer:
At the moment, only the core of the system is installed. To tune the system to your needs, you can choose to install one or more of the following predefined collections of software.
That is, you have a working core system at that point, and it's offering you the opportunity to install some more things that it thinks are coherent sets of packages for particular uses. Otherwise, you can carry on from there with the minimal install you already have.
If you leave the menu blank:
then no further packages will be installed. You have to unselect "Debian desktop environment" explicitly. You can later install whichever packages you need on top of that specifically after booting into the system.