If the amount of screws used in the dissembled are all the same size or just a few and easy to remember placement, then you don’t have to classify it, you can keep it safe.

It is best not to place the screws on a smooth surface or on the edge of the table. The screws may roll in all directions because of a sneeze or a small bump to the table.

Using fabrics that are malleable and can create a barrier like a sweater are great to use! These will keep your screws in place.

DO NOT place screws and other objects on items you may need to move, doing so can result in objects going in all sorts of directions. It's best to keep them on stable and not needed objects.

Don't put screws in the reach of your arm, otherwise an inadvertent arm swing will make the screw fall to the ground.

You can temporality place the screw in a drawer or on a shelf above you that way you need to get up to avoid accidental hits to your screws.

Do not remove screws on furniture like a Sofa or other area, you will lose screws if they fall in-between the cracks and will spend more money replacing them than using a table.

If a screw does fall to the ground, use a magnet to wave over the suspected fall path to pull it out. Or when a screw does fall, stop what you are doing and watch it fall and make note of any sound of where it rolls to make finding it easier.