How to remove a Monstera leaf
To remove one leaf, cut only its stalk. Keep the thick main stem, buds and aerial roots.

Before you start
Follow the leaf blade down its own stalk to where it joins the thicker stem. Move nearby leaves aside so you can see the stalk, the main stem and any aerial roots separately.
How to do it
Use clean shears to snip the leaf stalk near its base, leaving a little space between the cut and the main stem. Avoid cutting into a bud, the main stem or an aerial root.
When to stop and recheck
If the leaf still has healthy green tissue and is only torn, you can leave it. If the join is hidden or you are not sure which part is the stalk, wait.