Right-click on the menu button, choose "Application Launcher Settings". Checkmark "Show applications by name". Perhaps that makes it sort as you want. You may also try from the right-click on the menu button to "Switch to Classic Menu Style", which may appeal to you more.
If you want to suggest improvements to KDE, you have to do that upstream (Linux Mint team are not the developers of KDE or its components). KDE does have a brainstorm section on their forum: https://forum.kde.org/viewforum.php?f=83
. But I'd perhaps first post a question on their forums, if there is a way to sort the menu as you want (if neither of the above options does what you want).