Give Application Dashboard a try. It is what I use on my touchscreen laptop. Its fullscreen and uses the screen space by offering categories. UX you posted makes more sense on a screen that is severely space restricted, which is where plasma-mobile has a launcher which is similar to what you show.
On Saturday, 29 May 2021 22:47:19 CEST Regern Faraja wrote: > The current layout of Application launcher is perfect for use > with a mouse or touchpad. > However when it comes to tablets or monitors with touch option, > it gets a little hard to use. > A layout where "all applications" are in grid and can be > scrolled (continously) with touchpad gestures(eg two finger > scrolling), or screen gestures can be very useful. > I know this will be a more "Simple" approach which may not > match kde's "feature rich" spirit. > > My ideal menu would look like the attachment below (from > arcmenu-gnome). A search, app grid, (and maybe session > buttons)