I mean the ones that appear in the launcher. There are files in your Linux container that specify the icon, the program to launch and a number of other things. Where are they located? Launch your terminal (or your favorite Linux file browser) and navigate to ~/.local/share/applications/ and/or /usr/share/applications/ and there you should find a number of files ending in .desktop. These are text files that contain the specifications for the applications that will be shown in the launcher (it is, in fact, a standard across Linux that is defined in https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html). You can modify them, add, or delete them but I find it useful just to look through the files to see what’s executed and the other various parameters associated with launching an program by way of its icon.