Hi and welcome to Fedora!
You would also install the IDEs inside the toolbox. There is a VSCode Fedora repo, while I would recommend vscodium.
Their install guide also works on Fedora Atomic Desktops.
Note that the dnf system-upgrade plugin doesnt work inside a Toolbox/Distrobox. So you need to rebuild the box with the then latest version.
Also note that I would recommend Distrobox with this trick