[(Affinity Designer) Color selection question.]

It is a pity that there is no such option. Anyway, thank you very much for trying to help me! 

[(Affinity Designer) Color selection question.]

This is my first post on the forum, so first I'd like to say hello to the Affinity community! Even the rhyme was found!

I have a question for more familiar Affinity Designer users. I received the task of simplifying the vector illustration. The problem is that the illustrator has made some 1,500 layers. My task is to simplify the illustration as much as possible, that is, to group colors, make a uniform fill under layers, etc. My question is, is there any way to indicate the selected color, for example red and to select all layers with a given color and combine them? I admit that scrolling through 1,500 layers (they are not in order) and looking for elements of illustrations is a bit (well, damn) frustrating. Do you have any ideas how to simplify such illustrations in a quick way and is there an option I mentioned above? I apologize in advance for my English!