Most keyboards have a spacebar key, the large key at the bottom of the keyboard used to enter a space character. Over time, the spacebar key can become loose, making it difficult to type. There are a few ways to fix a loose spacebar key.
One way to fix a loose spacebar key is to simply remove the key and then reinsert it. To do this, gently pull up on the spacebar key until it pops out of place. Then, line up the key with the corresponding slot on the keyboard and press down until it snaps into place. If the spacebar key is still loose, you may need to use a small amount of adhesive to secure it in place.