That's a partial explanation. On my two W11 machines, it works as per my description - but on my Lenovo W10 laptop it differs. I don't have a printscreen button on that one and if I try to use the snipping tool the popup disappears, doh. Either way, the emojis etc window appears when pressing Windows and "." but it looks different.
There's now only 3 symbols at the top of the popup - emojis, kaomojis and symbols. The symbols are filtered down by clicking on a capital Omega Ω - but you still have a lot of symbols left. The bottom row of the symbols displayed is another filter, although that's not obvs. The 3rd from the left on that bottom row is a dollar sign $ naturally and this filters out the currency symbols including the ? sign. Once you've done this, the ? symbol will appear in the "recently used" list.
Don't forget - nothing is easy.