Unfortunately LDD has been actively deprecated for quite a number of years and LEGO officially noted they would not be updating the parts set and would, in fact, be removing some parts quite a few years ago.
The only solution is to use one of the alternatives such as any of the options that use the LDraw libraries. One of the more popular right now (for ...
One guy found a way to make the EV3 Brick's screen have light on it like it is on any device, but if you think training for soldering and blowing $30 just to see your EV3's screen is not worth it, you might as well use a lamp.
Here's the video: https://www.youtube.com/watch?v=gPNJC5Uz9HY&t=0s