I'm not positive, but I think some people use spice organizers like this:
https://www.amazon.com/Seville-Classics-Expandable-Cabinet-Organizer/dp/B001E2864K/ref=sr_1_27?crid=1B4SMBJSV7P9D&dchild=1&keywords=spice+rack+organizer&qid=1628652859&sprefix=spice+rack+%2Caps%2C274&sr=8-27
That's one cool wall display cabinet. @ChessAuthor has it correct. I think one member brought up the spice rack in another recent thread. Here it is https://www.chess.com/forum/view/chess-equipment/the-knights-set-by-oleg-raikis?page=3
There's display cases too like this.
https://www.amazon.co.uk/dp/B0897TZHST/ref=cm_sw_r_cp_apa_glt_fabc_J0C74HQ4KKGRTDJ15QTP
One thing to keep in mind for chess board shelves. Be aware of the depth of the shelf. Let's say you have a large 23" board to vertically display. The bottom part of the board that is resting on the shelf should be about +5-6 inches or so away from the wall to avoid it accidentally tipping forward.
Lego Minifig display cases can be a bit more polished looking. Just double-check the measurements.
I'm looking for set and board display product and ideas. I've seen some members of this forum post their sets on little display stands that look like they were made for chess sets. But I can't find them when looking at my go to chess equipment sites. I'm also thinking of those glass cases that are made specifically for a chess board with the pieces on it, but can't find that either.
I've found this product on Etsy that I like but I wish it had a glass door on the front of it.
A friend of mine also suggested using a picture wall ledge shelf to display a board. This product on Amazon has a chess board on it in one of the photos under the listing.
So, what are you all using to display your chess equipment?