Well when you buy a stock on the stock market, all they do is put a "1" in your portfolio for whatever stock you bought, they can also easily create it out of thin air.
Stocks on the basic level can't create a stock out of thin air, they have some sort of valuation or something that puts the amount of stock that they are valued.
Same with going to a bank, getting a mortgage for $500,000. All they do is put a few numbers on a few pieces of paper for you to sign, you never actually see this money. This is because everything is done digitally these days. Just because you can't psychically feel it, doesn't mean it doesn't exist.
Digitalization made people think that we are creating money out of thin air, in fact, it has been a thing since the inception of humanity and trade, who says what that gold is worth, we see it as shiny so we value it as precious. Banks don't have a lot of money in their buildings, most of it are circulated so that it could grow and get the economy pumping. I do agree, physical feeling about the worth of a paper is all about trust.