Learn English – Which synonym can I use for the word “desired” in this context

This is not a synonym per se, in my opinion, but if I understand your intended meaning correctly, you could use this word:

optimal (or optimum)
^adjective
best or most suitable within a range of possibilities

Other possible words came to mind are ideal, suitable, favorable, or simply best.

Another note: I think your sentence would sound better without the word location, and I would use user interface rather than visible interface, and maybe users instead of consumers. Thus,

The monitoring component is the user interface which the users interact with to visualize the optimal routes.