Awkwardly, carefully, and as little as possible. Yes, walking on road cleats is awkward, tedious, and even unsafe on some floor surfaces. This is because the size of the cleat precludes compatible road shoes from incorporating tread onto their outsoles. Additionally, the size, shape, and position of the cleats themselves prevent a regular walking motion. This is not to say that you can’t or shouldn’t walk in your road bike shoes, you’ll just want to be careful if/when you do. Thankfully, most road bike shoes have a small traction pad on the heel, and many road cleats also have a small amount of grippier material applied to the contact points to add a tiny level of grip for walking. With some practice, it does become easier, but it never stops being awkward.