Concealing Tzitzit in a Cemetery Away from a Grave

If someone enters a cemetery and does not come within four cubits of a grave, but stands at a distance, is it necessary to tuck in the tzitzit?

In a cemetery, even if standing at a distance of four cubits, one must tuck in the tzitzit. However, if one is going to a Kohanim section and knows they will not come within four cubits of a grave, and walks on paths not designated for future graves, leniency can be applied.

Biur Halacha, Siman 45, Sif 1, D"H "אסור לכנוס" — there are three opinions: 1. The opinion of the Bach is that even in a cemetery, the prohibition exists only within four cubits of a grave. 2. The opinion of the Tur is to be stringent due to a fence, outside the four cubits of a grave, if standing in a cemetery [meaning a place designated for graves, but outside the cemetery, there is no need to be stringent, as explained by the A"A, that no fence is made for a fence]. 3. The Magen Avraham explained that within four cubits of the cemetery is also prohibited. The Biur Halacha concludes: "From this, it follows that from the ground designated for graves and beyond, there is certainly no prohibition even one cubit if there are four cubits from the grave. However, from the place of graves and inward, even if it happens to be more than four cubits away from the grave, the N"S wrote that there is room to be stringent."

Mishna Berura, Siman 45, S"K 1: "And yet it is proper not to enter at all with tefillin on one's head if within the fence of the cemetery, lest one inadvertently come within four cubits of any grave."