This is a Hebrew proverb, and it means that this "sheet" cannot contain everything it should contain. Or in other words, "it is impossible to cover it all."

So an accurate translation can either be -
"it is impossible to cover it all"

Or, if you want something more literal -
"there is not enough time or space to cover it all"

This is a phrase in Hebrew that is usually used to express when someone is at a loss of words to describe something, usually negative, but not always.
Or when there is not enough space to express one's opinion. For example on Twitter (X) where there is a character limit.